- dovecot - dovecot.org

[BUG] imap-login segfault when running nmap -sV
by Florian Pritz 24 Apr '15

24 Apr '15

Hi, I've noticed that nmap crashes my imap-login (also pop3-login) and narrowed it down to `nmap -sV -p 993 $host`. I've noticed that if I remove "ssl_protocols = !SSLv2 !SSLv3" from my config or enable SSLv3 rather than disabling it the segfault disappears. I'm running on Arch Linux with dovecot 2.2.16-1 and openssl 1.0.2.a-1. I've also attached a network capture, but since it's SSL this probably won't help all that much. I hope this is enough information to reproduce the issue. If necessary I can recompile dovecot with debug symbols for a better backtrace. Thanks, Florian dovecot.conf https://paste.xinu.at/PUsJ/ syslog: > Apr 21 10:52:16 karif dovecot[7849]: imap-login: Disconnected (no auth attempts in 6 secs): user=<>, rip=81.217.47.122, lip=78.46.56.141, TLS handshaking: SSL_accept() failed: error:1407609C:SSL routines:SSL23_GET_CLIENT_HELLO:http request > Apr 21 10:52:16 karif dovecot[7849]: imap-login: Fatal: master: service(imap-login): child 7879 killed with signal 11 (core not dumped - add -D parameter to service imap-login { executable } [last ip=81.217.47.122] > Apr 21 10:52:16 karif kernel: imap-login[7879] segfault at f0 ip 00007fb2b8b1360b sp 00007fff926ffd50 error 4 in libssl.so.1.0.0[7fb2b8af3000+6f000] backtrace: > #0 0x00007f120100260b in ssl3_get_client_hello () from /usr/lib/libssl.so.1.0.0 > #1 0x00007f120100738f in ssl3_accept () from /usr/lib/libssl.so.1.0.0 > #2 0x00007f1201012b36 in ssl3_write_bytes () from /usr/lib/libssl.so.1.0.0 > #3 0x00007f1201906200 in ?? () from /usr/lib/dovecot/libdovecot-login.so.0 > #4 0x00007f12019062d8 in ?? () from /usr/lib/dovecot/libdovecot-login.so.0 > #5 0x00007f1201905f72 in ssl_proxy_destroy () from /usr/lib/dovecot/libdovecot-login.so.0 > #6 0x00007f12019060e4 in ?? () from /usr/lib/dovecot/libdovecot-login.so.0 > #7 0x00007f1201906671 in ?? () from /usr/lib/dovecot/libdovecot-login.so.0 > #8 0x00007f1201902efa in ?? () from /usr/lib/dovecot/libdovecot-login.so.0 > #9 0x00007f120162d503 in ?? () from /usr/lib/dovecot/libdovecot.so.0 > #10 0x00007f120168d62c in io_loop_call_io () from /usr/lib/dovecot/libdovecot.so.0 > #11 0x00007f120168e665 in io_loop_handler_run_internal () from /usr/lib/dovecot/libdovecot.so.0 > #12 0x00007f120168d699 in io_loop_handler_run () from /usr/lib/dovecot/libdovecot.so.0 > #13 0x00007f120168d718 in io_loop_run () from /usr/lib/dovecot/libdovecot.so.0 > #14 0x00007f120162cb23 in master_service_run () from /usr/lib/dovecot/libdovecot.so.0 > #15 0x00007f1201903788 in login_binary_run () from /usr/lib/dovecot/libdovecot-login.so.0 > #16 0x00007f120127d800 in __libc_start_main () from /usr/lib/libc.so.6 > #17 0x0000000000402909 in _start () nmap output: >> nmap -sV --packet-trace -p 993 karif > > Starting Nmap 6.47 ( http://nmap.org ) at 2015-04-21 10:52 CEST > CONN (0.0426s) TCP localhost > 78.46.56.141:80 => Operation now in progress > CONN (0.0427s) TCP localhost > 78.46.56.141:443 => Operation now in progress > NSOCK INFO [0.0650s] nsi_new2(): nsi_new (IOD #1) > NSOCK INFO [0.0650s] nsock_connect_udp(): UDP connection requested to 192.168.4.1:53 (IOD #1) EID 8 > NSOCK INFO [0.0650s] nsock_read(): Read request from IOD #1 [192.168.4.1:53] (timeout: -1ms) EID 18 > NSOCK INFO [0.0650s] nsock_trace_handler_callback(): Callback: CONNECT SUCCESS for EID 8 [192.168.4.1:53] > NSOCK INFO [0.0650s] nsock_trace_handler_callback(): Callback: WRITE SUCCESS for EID 27 [192.168.4.1:53] > NSOCK INFO [0.0650s] nsock_trace_handler_callback(): Callback: READ SUCCESS for EID 18 [192.168.4.1:53] (79 bytes): .............141.56.46.78.in-addr.arpa..................karif.server-speed.net. > NSOCK INFO [0.0650s] nsock_read(): Read request from IOD #1 [192.168.4.1:53] (timeout: -1ms) EID 34 > NSOCK INFO [0.0650s] nsi_delete(): nsi_delete (IOD #1) > NSOCK INFO [0.0650s] msevent_cancel(): msevent_cancel on event #34 (type READ) > CONN (0.0656s) TCP localhost > 78.46.56.141:993 => Operation now in progress > NSOCK INFO [0.1320s] nsi_new2(): nsi_new (IOD #1) > NSOCK INFO [0.1330s] nsock_connect_tcp(): TCP connection requested to 78.46.56.141:993 (IOD #1) EID 8 > NSOCK INFO [0.1550s] nsock_trace_handler_callback(): Callback: CONNECT SUCCESS for EID 8 [78.46.56.141:993] > Service scan sending probe NULL to 78.46.56.141:993 (tcp) > NSOCK INFO [0.1550s] nsock_read(): Read request from IOD #1 [78.46.56.141:993] (timeout: 6000ms) EID 18 > NSOCK INFO [6.1610s] nsock_trace_handler_callback(): Callback: READ TIMEOUT for EID 18 [78.46.56.141:993] > Service scan sending probe GetRequest to 78.46.56.141:993 (tcp) > NSOCK INFO [6.1610s] nsock_read(): Read request from IOD #1 [78.46.56.141:993] (timeout: 5000ms) EID 34 > NSOCK INFO [6.1610s] nsock_trace_handler_callback(): Callback: WRITE SUCCESS for EID 27 [78.46.56.141:993] > NSOCK INFO [6.1840s] nsock_trace_handler_callback(): Callback: READ ERROR [Connection reset by peer (104)] for EID 34 [78.46.56.141:993] > NSOCK INFO [6.1840s] nsi_delete(): nsi_delete (IOD #1) > NSOCK INFO [6.1840s] nsi_new2(): nsi_new (IOD #2) > NSOCK INFO [6.1840s] nsock_connect_tcp(): TCP connection requested to 78.46.56.141:993 (IOD #2) EID 40 > NSOCK INFO [6.2050s] nsock_trace_handler_callback(): Callback: CONNECT SUCCESS for EID 40 [78.46.56.141:993] > Service scan sending probe SSLSessionReq to 78.46.56.141:993 (tcp) > NSOCK INFO [6.2060s] nsock_read(): Read request from IOD #2 [78.46.56.141:993] (timeout: 5000ms) EID 58 > NSOCK INFO [6.2060s] nsock_trace_handler_callback(): Callback: WRITE SUCCESS for EID 51 [78.46.56.141:993] > NSOCK INFO [6.2280s] nsock_trace_handler_callback(): Callback: READ SUCCESS for EID 58 [78.46.56.141:993] (7 bytes): ......( > Service scan match (Probe SSLSessionReq matched with SSLSessionReq line 10443): 78.46.56.141:993 is ssl. Version: |TLSv1||| > NSOCK INFO [6.2280s] nsi_delete(): nsi_delete (IOD #2) > NSOCK INFO [6.2280s] nsi_new2(): nsi_new (IOD #3) > NSOCK INFO [6.2280s] nsock_connect_ssl(): SSL connection requested to 78.46.56.141:993/tcp (IOD #3) EID 65 > NSOCK INFO [6.3370s] nsock_trace_handler_callback(): Callback: SSL-CONNECT SUCCESS for EID 65 [78.46.56.141:993] > Service scan sending probe NULL to 78.46.56.141:993 (tcp) > NSOCK INFO [6.3370s] nsock_read(): Read request from IOD #3 [78.46.56.141:993] (timeout: 6000ms) EID 74 > NSOCK INFO [6.3960s] nsock_trace_handler_callback(): Callback: READ SUCCESS for EID 74 [78.46.56.141:993] (114 bytes) > Service scan match (Probe NULL matched with NULL line 1312): 78.46.56.141:993 is SSL/imap. Version: |Dovecot imapd||| > NSOCK INFO [6.3960s] nsi_delete(): nsi_delete (IOD #3) > Nmap scan report for karif (78.46.56.141) > Host is up (0.023s latency). > rDNS record for 78.46.56.141: karif.server-speed.net > PORT STATE SERVICE VERSION > 993/tcp open ssl/imap Dovecot imapd > > Service detection performed. Please report any incorrect results at http://nmap.org/submit/ . > Nmap done: 1 IP address (1 host up) scanned in 6.40 seconds

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(no subject)
by Kevin Laurie 24 Apr '15

24 Apr '15

1 0

acl and lazy_expunge plugins are incompatible?
by Paolo Cravero 24 Apr '15

24 Apr '15

Hello list. Following two previous unanswered requests (http://www.dovecot.org/list/dovecot/2014-August/097449.html and http://www.dovecot.org/list/dovecot/2014-May/096261.html) I fell into the same problem: ACL and lazy_expunge plugins do not work together. I had lazy_expunge enabled working OK. Then I activated ACL plugin, and gave dovecot.2 visibily over paolo.cravero's Inbox: the IMAP connection fails on server-side. Relevant debug log is: Mar 3 15:59:02 tst-msg03 dovecot: imap(dovecot.2(a)csi.it): Debug: Quota grace: root=User quota bytes=576716800 (10%) Mar 3 15:59:02 tst-msg03 dovecot: imap(dovecot.2(a)csi.it): Debug: dict quota: user=paolo.cravero(a)csi.it, uri=file:/maildata1/home/csi.it/p/paolo.cravero/dovecot-quota, noenforcing=0 Mar 3 15:59:02 tst-msg03 dovecot: imap(dovecot.2(a)csi.it): Debug: fs: root=/maildata1/main/csi.it/p/paolo.cravero, index=/maildata1/indexes/csi.it/p/paolo.cravero, indexpvt=, control=, inbox=, alt=/maildata1/altstorage/csi.it/p/paolo.cravero Mar 3 15:59:02 tst-msg03 dovecot: imap(dovecot.2(a)csi.it): Debug: acl: initializing backend with data: vfile Mar 3 15:59:02 tst-msg03 dovecot: imap(dovecot.2(a)csi.it): Debug: acl: acl username = paolo.cravero(a)csi.it Mar 3 15:59:02 tst-msg03 dovecot: imap(dovecot.2(a)csi.it): Debug: acl: owner = 1 Mar 3 15:59:02 tst-msg03 dovecot: imap(dovecot.2(a)csi.it): Debug: acl vfile: Global ACLs disabled Mar 3 15:59:02 tst-msg03 dovecot: imap(dovecot.2(a)csi.it): Fatal: lazy_expunge: Unknown namespace: '.EXPUNGED/' Removing the lazy_expunge, ACLs do work as expected and I can add/remove/use them. Is there a known compatibility issue? Or there's something wrong in my config and someone else is running with both plugins enabled? Thanks, Paolo PS: output of dovecot -n: # 2.2.15: /etc/dovecot/dovecot.conf # OS: Linux 2.6.32-431.el6.x86_64 x86_64 Red Hat Enterprise Linux Server release 6.5 (Santiago) ext3 auth_mechanisms = plain login disable_plaintext_auth = no imap_client_workarounds = tb-extra-mailbox-sep lmtp_save_to_detail_mailbox = yes mail_attachment_dir = /maildata1/attachments mail_attachment_hash = %{sha256} mail_debug = yes mail_gid = 500 mail_location = mdbox:/maildata1/main/%d/%1n/%n:ALT=/maildata1/altstorage/%d/%1n/%n:INDEX=/maildata1/indexes/%d/%1n/%n mail_plugins = quota mail_log notify lazy_expunge acl mail_uid = 500 managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave duplicate mbox_write_locks = fcntl mdbox_rotate_size = 50 M namespace { hidden = no list = yes location = mdbox:/maildata1/main/%d/%1n/%n:INDEX=/maildata1/indexes/%d/%1n/%n:MAILBOXDIR=expunged prefix = .EXPUNGED/ subscriptions = no } namespace { list = children location = mdbox:/maildata1/main/%%d/%%1n/%%n:ALT=/maildata1/altstorage/%%d/%%1n/%%n:INDEX=/maildata1/indexes/%%d/%%1n/%%n prefix = user/%%u/ separator = / type = shared } namespace inbox { inbox = yes location = mailbox Drafts { auto = subscribe special_use = \Drafts } mailbox Junk { auto = subscribe special_use = \Junk } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { auto = subscribe special_use = \Trash } prefix = type = private } passdb { args = /etc/dovecot/dovecot-ldap.conf.ext driver = ldap } plugin { acl = vfile acl_shared_dict = file:/maildata1/db/shared-mailboxes.db lazy_expunge = .EXPUNGED/ mail_log_events = delete undelete expunge copy mailbox_delete mailbox_rename flag_change append mail_log_fields = uid box msgid size flags vsize quota = dict:User quota::file:%h/dovecot-quota quota_grace = 10%% quota_rule = *:storage=10G quota_rule2 = Trash:storage=+100M quota_warning = storage=95%% quota-warning 95 %u quota_warning2 = storage=80%% quota-warning 80 %u } protocols = imap pop3 lmtp sieve service auth { unix_listener auth-userdb { group = vmail user = vmail } } service lmtp { inet_listener lmtp { address = 10.102.42.114 port = 24 } process_min_avail = 2 user = vmail } ssl_cert = </etc/pki/dovecot/certs/dovecot.pem ssl_key = </etc/pki/dovecot/private/dovecot.pem userdb { args = /etc/dovecot/dovecot-ldap.conf.ext driver = ldap } protocol lmtp { mail_plugins = quota mail_log notify lazy_expunge acl sieve } protocol lda { mail_plugins = quota mail_log notify lazy_expunge acl sieve } protocol imap { mail_plugins = quota mail_log notify lazy_expunge acl imap_quota imap_acl }

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fts_languages setting is missing - disabling?
by Ralf Hildebrandt 24 Apr '15

24 Apr '15

I don't find "fts_languages" in the documentation... What should I add there anbd where? doveadm(restore): Error: fts-dovecot: fts_languages setting is missing - disabling -- [*] sys4 AG http://sys4.de, +49 (89) 30 90 46 64 Franziskanerstraße 15, 81669 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein

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Crash in dovecot/auth with backtrace
by Ralf Hildebrandt 24 Apr '15

24 Apr '15

I'm seeing this odd crash with "USER\t531\t*(a)liquid-scan.de\tservice=quota-status" Which looks like something is being tested against our quota-status -- but I fail to see why an NON LOCAL address is being tested.... GNU gdb (GDB) 7.4.1-debian Copyright (C) 2012 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "i486-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /usr/local/dovecot-2.2/libexec/dovecot/auth...done. [New LWP 2289] [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/i386-linux-gnu/i686/cmov/libthread_db.so.1". Core was generated by `dovecot/auth'. Program terminated with signal 6, Aborted. #0 0xb7724424 in __kernel_vsyscall () #0 0xb7724424 in __kernel_vsyscall () No symbol table info available. #1 0xb74a0661 in *__GI_raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64 resultvar = <optimized out> pid = -1218617356 selftid = 2289 #2 0xb74a3a92 in *__GI_abort () at abort.c:92 act = {__sigaction_handler = {sa_handler = 0xbfd1c924, sa_sigaction = 0xbfd1c924}, sa_mask = {__val = {3077760610, 3218196756, 3076712520, 3218196744, 3077843556, 0, 3074764848, 1, 0, 1, 3077716256, 145215752, 1097, 3077184659, 3, 145244200, 1, 128, 0, 3218196816, 3218196744, 3218196756, 3218196764, 3077716256, 0, 3077194863, 145215720, 3076749582, 3077199789, 3077686824, 1097, 3077686824}}, sa_flags = 0, sa_restorer = 0xb76a5c2f <internal_handler+527>} sigs = {__val = {32, 0 <repeats 31 times>}} #3 0xb76a624e in default_fatal_finish (type=<optimized out>, status=status@entry=0) at failures.c:202 backtrace = 0x8a7c8d8 "/usr/local/dovecot-2.2/lib/dovecot/libdovecot.so.0(+0x7825e) [0xb76a625e] -> /usr/local/dovecot-2.2/lib/dovecot/libdovecot.so.0(+0x782e1) [0xb76a62e1] -> /usr/local/dovecot-2.2/lib/dovecot/libdovecot."... #4 0xb76a62e1 in i_internal_fatal_handler (ctx=0xbfd1c9f0, format=0x807a0c4 "file %s: line %d (%s): assertion failed: (%s)", args=0xbfd1ca14 "\257j\a\b\371\004") at failures.c:671 status = 0 #5 0xb76a6e5f in i_panic ( format=format@entry=0x807a0c4 "file %s: line %d (%s): assertion failed: (%s)") at failures.c:276 ctx = {type = LOG_TYPE_PANIC, exit_status = 0, timestamp = 0x0, timestamp_usecs = 0} args = 0xbfd1ca14 "\257j\a\b\371\004" #6 0x0805873a in auth_request_set_login_username (request=0x8a945d8, username=0x8a7c548 "", error_r=0xbfd1cad4) at auth-request.c:1273 master_passdb = <optimized out> __FUNCTION__ = "auth_request_set_login_username" #7 0x08054c44 in master_input_auth_request (conn=conn@entry=0x8aa18b8, args=args@entry=0x8a941c1 "531\t*(a)liquid-scan.de\tservice=quota-status", cmd=cmd@entry=0x8076925 "USER", request_r=request_r@entry=0xbfd1cad0, error_r=error_r@entry=0xbfd1cad4) at auth-master-connection.c:209 auth_request = 0x8a945d8 list = 0x8a7c53c name = <optimized out> arg = <optimized out> username = 0x8a7c504 "*(a)liquid-scan.de" id = 531 #8 0x0805539c in master_input_user ( args=0x8a941c1 "531\t*(a)liquid-scan.de\tservice=quota-status", conn=0x8aa18b8) at auth-master-connection.c:306 auth_request = 0x8a92e70 error = 0x8ab8e81 "31298" ret = <optimized out> #9 auth_master_input_line ( line=0x8a941bc "USER\t531\t*(a)liquid-scan.de\tservice=quota-status", conn=0x8aa18b8) at auth-master-connection.c:615 No locals. #10 master_input (conn=0x8aa18b8) at auth-master-connection.c:679 _data_stack_cur_id = 3 line = <optimized out> ret = 40 #11 0xb76baf8b in io_loop_call_io (io=0x8a92ba8) at ioloop.c:501 ioloop = 0x8a844e8 t_id = 2 __FUNCTION__ = "io_loop_call_io" #12 0xb76bc272 in io_loop_handler_run_internal (ioloop=ioloop@entry=0x8a844e8) at ioloop-epoll.c:220 ctx = 0x8a8b500 events = 0x8f1 event = 0x8a8b558 list = 0x8a92be0 io = <optimized out> tv = {tv_sec = 0, tv_usec = 999856} events_count = <error reading variable events_count (Could not find type for DW_OP_GNU_const_type)> msecs = <optimized out> ret = 3 i = <optimized out> j = <optimized out> call = <optimized out> __FUNCTION__ = "io_loop_handler_run_internal" #13 0xb76bb01c in io_loop_handler_run (ioloop=ioloop@entry=0x8a844e8) at ioloop.c:548 No locals. #14 0xb76bb0a8 in io_loop_run (ioloop=0x8a844e8) at ioloop.c:525 __FUNCTION__ = "io_loop_run" #15 0xb76527ae in master_service_run (service=0x8a84418, callback=0x8063df0 <client_connected>) at master-service.c:569 No locals. #16 0x08064490 in main (argc=1, argv=0x8a841e0) at main.c:393 c = <optimized out> -- Ralf Hildebrandt Geschäftsbereich IT | Abteilung Netzwerk Charité - Universitätsmedizin Berlin Campus Benjamin Franklin Hindenburgdamm 30 | D-12203 Berlin Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962 ralf.hildebrandt(a)charite.de | http://www.charite.de

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doveadm problem
by T.Tributh 24 Apr '15

24 Apr '15

Hi, since several versions i have the following problem: Actually i am using: dovecot --version 2.2.16 (de2023e630cb) When i try to use doveadm i see the following error: doveadm pw -t {SSHA512}cywDi7p60qc1K0mK4zAC2NrnK86hntGgbQcAh3H9U3WEpZMFk1hj/MYQ81hJouP1FOsF/Jasc1BjzdaPeUU5fYLitEzV -p 1234 Fatal: Couldn't load required plugin /usr/lib/dovecot/modules/lib11_imap_quota_plugin.so: dlopen() failed: /usr/lib/dovecot/modules/lib11_imap_quota_plugin.so: undefined symbol: command_unregister I recognized that these lines in my main dovecot.conf are responsible: mail_plugins = quota imap_quota When i change it to mail_plugins = quota The command is working like expected: doveadm pw -t {SSHA512}cywDi7p60qc1K0mK4zAC2NrnK86hntGgbQcAh3H9U3WEpZMFk1hj/MYQ81hJouP1FOsF/Jasc1BjzdaPeUU5fYLitEzV -p 1234 {SSHA512}cywDi7p60qc1K0mK4zAC2NrnK86hntGgbQcAh3H9U3WEpZMFk1hj/MYQ81hJouP1FOsF/Jasc1BjzdaPeUU5fYLitEzV (verified) ....but than my thunderbird-client is not longer able to recognize to mailbox-size. Regards Torsten Tributh

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Dovecot 2.2.16 crashes when fetching mails with Trojita 0.5
by Dennis Schridde 23 Apr '15

23 Apr '15

Hello! When I fetch certain emails from my Dovecot 2.2.16 server using Trojita 0.5, dovecot/imap will crash reproducibly. Please find config and backtrace from coredump attached. Best regards, Dennis

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Moving a local domain to sql
by ＠lbutlr 22 Apr '15

22 Apr '15

I have a domain that current maps to local users that I want to move into the mysql maps with all the other domains, but I am unsure of the best way to proceed with this. For example, my mail server is covisp.net and my personal domain is kreme.com, and currently kremels(a)kreme.com maps to the local user kremels. I want it to map to the existing mysql database as “kernels(a)kreme.xn--com-9o0a. (For example only, I’m not moving kreme.com, I am too dependent on procmail for all my list processing). Once I setup the user account in the mysql database do I just move the Maildir from /home/kremels to /usr/local/virtual/kremels(a)kreme.com/ and reload dovecot? -- I leave symbols to the symbol-minded - George Carlin

3 2

dovecot efficient use of resources
by shouddy＠enet.cu 22 Apr '15

22 Apr '15

I just started a heavy load imap service and everything fitted OK in functional terms. The problem comes whith stress tests, I have no problem in the directors line. But my doubt comes whether the backends are using efficiently the resources assigned or not. The main goal is to maximize the concurrency without affect the integrity of operations. My question is: Is there a rule for relating the amount of computing resources (RAM, Processor) with the number of simultaneous connections to an IMAP/POP3 server running dovecot? I had made all the adjustmens for high performance in dovecot according to the docs and O.S specs Backend's hardware Processor: AMD Opteron(tm) Processor 6136 RAM: 16 GB HDD: Enought for testing I'm confident the NFS layer is not making noise (yet). Comparing the results, the output of tests are giving consistent numbers using local file systems (all of them properly tuned) I have run the tests with imaptest but even with 100 clients I'm having system's max load of 46 stable. I have the sense that memory is not using properly (2GB at most from 16GB). Thank you so much in advance, would be grateful for any help Conf below Dovecot version 2.2.10 doveconf -n # OS: Linux 3.10.0-123.20.1.el7.x86_64 x86_64 Red Hat Enterprise Linux Server release 7.0 (Maipo) nfs4 auth_mechanisms = plain login default_client_limit = 4000 disable_plaintext_auth = no listen = * mail_fsync = always mail_gid = 500 mail_location = maildir:/var/vmail/mailboxes/%d/%8n/%n:INDEX=MEMORY mail_nfs_index = yes mail_nfs_storage = yes mail_uid = 500 managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave mmap_disable = yes namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix = } passdb { args = /etc/dovecot/dovecot-ldap.conf.ext driver = ldap } plugin { sieve = ~/.dovecot.sieve sieve_dir = ~/sieve } service auth { client_limit = 14400 service_count = 0 unix_listener auth-userdb { group = vmail mode = 0640 user = vmail } } service doveadm { inet_listener { port = 24245 } } service imap-login { client_limit = 1000 process_limit = 100 process_min_avail = 16 service_count = 0 vsz_limit = 512 M } service imap { process_limit = 7000 service_count = 0 } service pop3-login { client_limit = 1000 process_limit = 100 process_min_avail = 16 service_count = 0 } service pop3 { process_limit = 7000 service_count = 0 } ssl_cert = </etc/pki/dovecot/certs/dovecot.pem ssl_key = </etc/pki/dovecot/private/dovecot.pem userdb { args = /etc/dovecot/dovecot-ldap.conf.ext driver = ldap } protocol imap { mail_max_userip_connections = 1000 } local 172.28.200.0/24/24 { doveadm_password = secret }

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Cant See Sent Mailbox despite GETACL [request for help]
by Kevin Laurie 21 Apr '15

21 Apr '15

Hi, Apparently the "Sent" mailbox cannot be viewed by Dave(the user). Any idea why? When I do GETACL for Sent, the message I get is shown below:- * ACL "Sent" "dave(a)mydomain.net" ilr "help(a)mydomain.net" lrwstipekxacd

2 1

cant see all users - need to create symlink between mailboxes [request for help]
by Kevin Laurie 21 Apr '15

21 Apr '15

Hi, I need to create a symlink to share mailboxes. I tried to check at : cd /var/mail/ but I cant see all the mailboxes. Could someone advise how to do this? I am trying to achieve as showing in tutorial here:- http://wiki.dovecot.org/SharedMailboxes/Symlinks Below is the details of my dovecot.conf Appreciate if anyone can help. # Listen addresses. # - '*' means all available IPv4 addresses. # - '[::]' means all available IPv6 addresses. # Listen on all available addresses by default listen = * [::] #base_dir = /var/run/dovecot mail_plugins = quota acl # Enable fts fts_solr plugin globally for Solr Full Text Search Indexing mail_plugins = $mail_plugins fts fts_solr plugin { fts = solr #break-imap-search will use solr for indexing TEXT and BODY searches. fts_solr = break-imap-search url=http://127.0.0.1:8983/solr/ fts_autoindex = yes } # Enabled mail protocols. protocols = pop3 imap sieve lmtp # User/group who owns the message files: mail_uid = 2000 mail_gid = 2000 # Assign uid to virtual users. first_valid_uid = 2000 last_valid_uid = 2000 # Logging. Reference: http://wiki2.dovecot.org/Logging log_path = /var/log/dovecot.log mail_debug = no auth_verbose = no auth_debug = no auth_debug_passwords = no # Possible values: no, plain, sha1. auth_verbose_passwords = no # SSL: Global settings. # Refer to wiki site for per protocol, ip, server name SSL settings: # http://wiki2.dovecot.org/SSL/DovecotConfiguration ssl_protocols = !SSLv2 !SSLv3 ssl = required verbose_ssl = no #ssl_ca =</path/to/ca ssl_cert = </etc/pki/tls/certs/iRedMail.crt ssl_key = </etc/pki/tls/private/iRedMail.key # With disable_plaintext_auth=yes AND ssl=required, STARTTLS is mandatory. # Set disable_plaintext_auth=no AND ssl=yes to allow plain password transmitted # insecurely. disable_plaintext_auth = yes # Allow plain text password per IP address/net #remote 192.168.0.0/24 { # disable_plaintext_auth = no #} # Mail location and mailbox format. mail_location = maildir:/%Lh/Maildir/:INDEX=/%Lh/Maildir/ # Authentication related settings. # Append this domain name if client gives empty realm. auth_default_realm = # Authentication mechanisms. auth_mechanisms = PLAIN LOGIN # Limits the number of users that can be logging in at the same time. # Default is 100. # Note: this value can be overrided by "process_limit =" in service protocol. # e.g. # protocol imap-login { # ... # process_limit = 500 # } #default_process_limit = 100 service auth { unix_listener /var/spool/postfix/private/dovecot-auth { user = postfix group = postfix mode = 0666 } unix_listener auth-master { user = vmail group = vmail mode = 0666 } unix_listener auth-userdb { user = vmail group = vmail mode = 0660 } } # LMTP server (Local Mail Transfer Protocol). # Reference: http://wiki2.dovecot.org/LMTP service lmtp { user = vmail # For higher volume sites, it may be desirable to increase the number of # active listener processes. A range of 5 to 20 is probably good for most # sites. process_min_avail = 5 # Logging. # Require 'info_log_path =' in 'protocol lmtp {}' block. executable = lmtp -L # Listening on socket file and TCP unix_listener /var/spool/postfix/private/dovecot-lmtp { user = postfix group = postfix mode = 0600 } inet_listener lmtp { #address = 192.168.0.24 127.0.0.1 ::1 port = 24 } } # Virtual mail accounts. userdb { args = /etc/dovecot/dovecot-mysql.conf driver = sql } passdb { args = /etc/dovecot/dovecot-mysql.conf driver = sql } # Master user. # Master users are able to log in as other users. It's also possible to # directly log in as any user using a master password, although this isn't # recommended. # Reference: http://wiki2.dovecot.org/Authentication/MasterUsers auth_master_user_separator = * passdb { driver = passwd-file args = /etc/dovecot/dovecot-master-users master = yes } plugin { auth_socket_path = /var/run/dovecot/auth-master quota = dict:user::proxy::quotadict quota_rule = *:storage=1G #quota_rule2 = *:messages=0 #quota_rule3 = Trash:storage=1G #quota_rule4 = Junk:ignore # Quota warning. # If user suddenly receives a huge mail and the quota jumps from # 85% to 95%, only the 95% script is executed. quota_warning = storage=85%% quota-warning 85 %u quota_warning2 = storage=90%% quota-warning 90 %u quota_warning3 = storage=95%% quota-warning 95 %u # Plugin: autocreate. Create and subscribe to default IMAP folders. autocreate = INBOX autocreate2 = Sent autocreate3 = Trash autocreate4 = Drafts autocreate5 = Junk autosubscribe = INBOX autosubscribe2 = Sent autosubscribe3 = Trash autosubscribe4 = Drafts autosubscribe5 = Junk # Plugin: expire. #expire = Trash 7 Trash/* 7 Junk 30 #expire_dict = proxy::expire # ACL and share folder acl = vfile acl_shared_dict = proxy::acl # By default Dovecot doesn't allow using the IMAP "anyone" or # "authenticated" identifier, because it would be an easy way to spam # other users in the system. If you wish to allow it, #acl_anyone = allow # Pigeonhole managesieve service. # Reference: http://wiki2.dovecot.org/Pigeonhole/Sieve/Configuration # Per-user sieve settings. sieve_dir = /%Lh/sieve sieve = /%Lh/sieve/dovecot.sieve # Global sieve settings. sieve_global_dir = /var/vmail/sieve # Note: if user has personal sieve script, global sieve rules defined in # sieve_default will be ignored. Please use sieve_before or # sieve_after instead. #sieve_default = sieve_before = /var/vmail/sieve/dovecot.sieve #sieve_after = # The maximum number of redirect actions that can be performed during a # single script execution. The meaning of 0 differs based on your version. # For versions v0.3.0 and beyond this means that redirect is prohibited. # For older versions, however, this means that the number of redirects is # unlimited, so be careful. #sieve_max_redirects = 4 } service quota-warning { executable = script /usr/local/bin/dovecot-quota-warning.sh unix_listener quota-warning { user = vmail group = vmail mode = 0660 } } service dict { unix_listener dict { mode = 0660 user = vmail group = vmail } } dict { #expire = db:/var/lib/dovecot/expire/expire.db quotadict = mysql:/etc/dovecot/dovecot-used-quota.conf acl = mysql:/etc/dovecot/dovecot-share-folder.conf } protocol lda { # Reference: http://wiki2.dovecot.org/LDA mail_plugins = $mail_plugins sieve autocreate auth_socket_path = /var/run/dovecot/auth-master log_path = /var/log/dovecot-sieve.log lda_mailbox_autocreate = yes postmaster_address = root } protocol lmtp { # Log file info_log_path = /var/log/dovecot-lmtp.log # Plugins mail_plugins = quota # Enable fts fts_solr plugin globally for Solr Full Text Search Indexing mail_plugins = $mail_plugins fts fts_solr plugin { fts = solr #break-imap-search will use solr for indexing TEXT and BODY searches. fts_solr = break-imap-search url=http://127.0.0.1:8983/solr/ fts_autoindex = yes } postmaster_address = postmaster lmtp_save_to_detail_mailbox = yes recipient_delimiter = + } protocol imap { mail_plugins = $mail_plugins imap_quota autocreate imap_acl imap_client_workarounds = tb-extra-mailbox-sep # Maximum number of IMAP connections allowed for a user from each IP address. # NOTE: The username is compared case-sensitively. # Default is 10. # Increase it to avoid issue like below: # "Maximum number of concurrent IMAP connections exceeded" mail_max_userip_connections = 20 } protocol pop3 { mail_plugins = $mail_plugins pop3_client_workarounds = outlook-no-nuls oe-ns-eoh pop3_uidl_format = %08Xu%08Xv # Maximum number of IMAP connections allowed for a user from each IP address. # NOTE: The username is compared case-sensitively. # Default is 10. mail_max_userip_connections = 20 } # Login processes. Refer to Dovecot wiki for more details: # http://wiki2.dovecot.org/LoginProcess service imap-login { service_count = 1 # To avoid startup latency for new client connections, set process_min_avail # to higher than zero. That many idling processes are always kept around # waiting for new connections. #process_min_avail = 0 # number of simultaneous IMAP connections #process_limit = $default_process_limit process_limit = 500 # vsz_limit should be fine at its default 64MB value #vsz_limit = 64M } service pop3-login { service_count = 1 # number of simultaneous POP3 connections #process_limit = 500 } namespace { type = private separator = / prefix = #location defaults to mail_location. inbox = yes } namespace { type = shared separator = / prefix = Shared/%%u/ location = maildir:/%%Lh/Maildir/:INDEX=/%%Lh/Maildir/Shared/%%u # this namespace should handle its own subscriptions or not. subscriptions = yes list = children } # Public mailboxes. # Refer to Dovecot wiki page for more details: # http://wiki2.dovecot.org/SharedMailboxes/Public #namespace { # type = public # separator = / # prefix = Public/ # # # CONTROL=: Mark this public folder as read-only mailbox # # INDEX=: Per-user \Seen flag # location = maildir:/var/vmail/public/:CONTROL=~/Maildir/public:INDEX=~/Maildir/public # # # Allow users to subscribe to the public folders. # subscriptions = yes #}

2 2

userdb username changed
by Péter Márton 20 Apr '15

20 Apr '15

Hi! I'm playing with a postfix + dovecot + mysql test setup, and noticed something strange. It seems that despite the "username changed" line, auth returns the original username: Apr 17 09:27:34 imap21 dovecot: quota-status: Debug: Loading modules from directory: /usr/lib64/dovecot (...) Apr 17 09:27:34 imap21 dovecot: auth-worker(27661): Debug: sql(ppp(a)example.net): SELECT at.userid AS user, at.home AS home, at.uid AS uid, at.gid AS gid, concat('*:storage=', at.quotabytes, 'b:messages=', at.quotamessages) AS quota_rule FROM auth at INNER JOIN mailaddr mt ON at.userid = mt.userid WHERE mt.mailaddress = 'ppp(a)example.net' OR at.userid = 'ppp(a)example.net' Apr 17 09:27:34 imap21 dovecot: auth-worker(27661): Debug: sql(ppp(a)example.net): username changed ppp(a)example.net -> uppp Apr 17 09:27:34 imap21 dovecot: auth: Debug: userdb out: USER#0111#011ppp@example.net#011home=/home/ppp#011uid=500#011gid=500#011quota_rule=*:storage=3100b:messages=1024 Apr 17 09:27:34 imap21 dovecot: quota-status: Debug: auth input: ppp(a)example.net home=/home/ppp uid=500 gid=500 quota_rule=*:storage=3100b:messages=1024 Apr 17 09:27:34 imap21 dovecot: quota-status: Debug: Added userdb setting: plugin/quota_rule=*:storage=3100b:messages=1024 Apr 17 09:27:34 imap21 dovecot: quota-status(ppp(a)example.net): Debug: Effective uid=500, gid=500, home=/home/ppp Apr 17 09:27:34 imap21 dovecot: quota-status(ppp(a)example.net): Debug: Quota root: name=User quota backend=dict args=:proxy::quota Apr 17 09:27:34 imap21 dovecot: quota-status(ppp(a)example.net): Debug: Quota rule: root=User quota mailbox=* bytes=3100 messages=1024 Apr 17 09:27:34 imap21 dovecot: quota-status(ppp(a)example.net): Debug: Quota grace: root=User quota bytes=310 (10%) Apr 17 09:27:34 imap21 dovecot: quota-status(ppp(a)example.net): Debug: dict quota: user=ppp(a)example.net, uri=proxy::quota, noenforcing=0 I've checked this with the LMTP service (i know, normally it wouldn't get mail addresses) and it produces the same: Apr 17 09:30:35 imap21 dovecot: auth-worker(27730): Debug: sql(ppp(a)example.net,127.0.0.1): SELECT at.userid AS user, at.home AS home, at.uid AS uid, at.gid AS gid, concat('*:storage=', at.quotabytes, 'b:messages=', at.quotamessages) AS quota_rule FROM auth at INNER JOIN mailaddr mt ON at.userid = mt.userid WHERE mt.mailaddress = 'ppp(a)example.net' OR at.userid = 'ppp(a)example.net' Apr 17 09:30:35 imap21 dovecot: auth-worker(27730): Debug: sql(ppp(a)example.net,127.0.0.1): username changed ppp(a)example.net -> uppp Apr 17 09:30:35 imap21 dovecot: auth: Debug: userdb out: USER#0111#011ppp@example.net#011home=/home/ppp#011uid=500#011gid=500#011quota_rule=*:storage=3100b:messages=1024 Apr 17 09:30:35 imap21 dovecot: lmtp(27728): Debug: auth input: ppp(a)example.net home=/home/ppp uid=500 gid=500 quota_rule=*:storage=3100b:messages=1024 Apr 17 09:30:35 imap21 dovecot: lmtp(27728): Debug: Added userdb setting: plugin/quota_rule=*:storage=3100b:messages=1024 Apr 17 09:30:35 imap21 dovecot: lmtp(27728, ppp(a)example.net) Debug: Effective uid=500, gid=500, home=/home/ppp Passdb works as it should. IMAP test: Apr 17 09:36:21 imap21 dovecot: auth-worker(27849): Debug: sql(ppp(a)example.net,10.10.128.25): query: SELECT at.userid AS user, at.password AS password, at.home AS userdb_home, at.uid AS userdb_uid, at.gid AS userdb_gid, concat('*:storage=', at.quotabytes, 'b:messages=', at.quotamessages) AS userdb_quota_rule FROM auth at INNER JOIN mailaddr mt ON at.userid = mt.userid WHERE mt.mailaddress = 'ppp(a)example.net' OR at.userid = 'ppp(a)example.net' Apr 17 09:36:21 imap21 dovecot: auth-worker(27849): Debug: sql(ppp(a)example.net,10.10.128.25): username changed ppp(a)example.net -> uppp Apr 17 09:36:21 imap21 dovecot: auth: Debug: sql(ppp(a)example.net,10.10.128.25,<ox/+ouYTQQDDyoAZ>): username changed ppp(a)example.net -> uppp Apr 17 09:36:21 imap21 dovecot: auth: Debug: client passdb out: OK#0111#011user=uppp#011original_user=ppp(a)example.net Apr 17 09:36:21 imap21 dovecot: auth: Debug: master in: REQUEST#0113358588929#01127844#0111#011dbf373ba260f9990e1ea6b688924d513#011session_pid=27850#011request_auth_token Apr 17 09:36:21 imap21 dovecot: auth: Debug: prefetch(uppp,10.10.128.25,<ox/+ouYTQQDDyoAZ>): success Apr 17 09:36:21 imap21 dovecot: auth: Debug: master userdb out: USER#0113358588929#011uppp#011home=/home/ppp#011uid=500#011gid=500#011quota_rule=*:storage=3100b:messages=1024#011auth_token=737d315a5c0e388a0b3dc2bea3c9e333357696d8#011auth_user=ppp@example.net Apr 17 09:36:21 imap21 dovecot: imap-login: Login: user=<uppp>, method=PLAIN, rip=10.10.128.25, lip=10.10.97.201, mpid=27850, TLS, session=<ox/+ouYTQQDDyoAZ> Apr 17 09:36:21 imap21 dovecot: imap: Debug: Loading modules from directory: /usr/lib64/dovecot Apr 17 09:36:21 imap21 dovecot: imap: Debug: Module loaded: /usr/lib64/dovecot/lib10_quota_plugin.so Apr 17 09:36:21 imap21 dovecot: imap: Debug: Module loaded: /usr/lib64/dovecot/lib11_imap_quota_plugin.so Apr 17 09:36:21 imap21 dovecot: imap: Debug: Added userdb setting: plugin/quota_rule=*:storage=3100b:messages=1024 Apr 17 09:36:21 imap21 dovecot: imap(uppp): Debug: Effective uid=500, gid=500, home=/home/ppp Can someone tell what should i do to make this work? Or any idea i could try? It would help if Postfix would be able to run Virtual before the policy check, but thats a problem for the postfix list. :) Thanks! Peter doveconf -n: # 2.2.15: /etc/dovecot/dovecot.conf # Pigeonhole version 0.4.6 (3e924b1b6c5c+) # OS: Linux 2.6.32-504.8.1.el6.x86_64 x86_64 CentOS release 6.6 (Final) auth_debug = yes auth_verbose = yes dict { quota = mysql:/etc/dovecot/dict-quota-sql.conf.ext } mail_access_groups = dovecot mail_debug = yes mail_fsync = always mail_plugins = quota managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave duplicate mbox_write_locks = fcntl mmap_disable = yes namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix = } passdb { args = /etc/dovecot/dovecot-example-mysql.conf.ext driver = sql } plugin { quota = dict:User quota::proxy::quota quota_status_nouser = 554 5.5.4 Who the f* is Alice? quota_status_overquota = 552 5.2.2 Mailbox is full quota_status_success = DUNNO } service dict { unix_listener dict { group = dovecot mode = 0660 } } service imap-login { inet_listener imap { port = 143 } } service lmtp { inet_listener lmtp { address = * port = 25 } } service pop3-login { inet_listener pop3 { port = 110 } } service quota-status { client_limit = 1 executable = quota-status -p postfix inet_listener { port = 252 } } ssl = required ssl_cert = </etc/pki/dovecot/certs/dovecot.pem ssl_key = </etc/pki/dovecot/private/dovecot.pem userdb { driver = prefetch } userdb { args = /etc/dovecot/dovecot-example-mysql.conf.ext driver = sql } protocol lmtp { mail_plugins = quota } protocol lda { mail_plugins = quota } protocol imap { mail_plugins = quota imap_quota } protocol pop3 { mail_plugins = quota } /etc/dovecot/dovecot-example-mysql.conf.ext: driver=mysql connect = host=10.10.90.206 dbname=mail user=user password=abcabcabc password_query = SELECT at.userid AS user, at.password AS password, \ at.home AS userdb_home, at.uid AS userdb_uid, at.gid AS userdb_gid, \ concat('*:storage=', at.quotabytes, 'b:messages=', at.quotamessages) AS userdb_quota_rule \ FROM auth at INNER JOIN mailaddr mt ON at.userid = mt.userid WHERE mt.mailaddress = '%u' OR at.userid = '%u' user_query = SELECT at.userid AS user, at.home AS home, at.uid AS uid, at.gid AS gid, \ concat('*:storage=', at.quotabytes, 'b:messages=', at.quotamessages) AS quota_rule \ FROM auth at INNER JOIN mailaddr mt ON at.userid = mt.userid WHERE mt.mailaddress = '%u' OR at.userid = '%u'

1 1

Authentication Error with Dovecot
by Kevin Laurie 18 Apr '15

18 Apr '15

Hello, I have some email authentication error with dovecot. Could someone tell me what is the problem that is indicated below? Is it due to some plugin? Apr 18 21:56:35 auth-worker(2057): Info: mysql(127.0.0.1): Connected to database vmail Apr 18 21:56:35 imap-login: Info: Login: user=<user(a)mydomain.net>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=2058, secured, session=<n/0fGAUUgwB/AAAB> Apr 18 21:56:35 imap: Error: Can't load plugin imap_acl_plugin: Plugin acl must be loaded also (you must set: mail_plugins=$mail_plugins acl) Apr 18 21:56:35 imap: Fatal: Couldn't load required plugins Apr 18 21:56:53 imap-login: Info: Disconnected (auth failed, 1 attempts in 2 secs): user=<user2>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured, session=<z2gKGQUUiQB/AAAB> Apr 18 21:57:05 imap-login: Info: Login: user=<user2(a)mydomain.net>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=2065, secured, session=<5tmoGQUUjQB/AAAB> Apr 18 21:57:05 imap: Error: Can't load plugin imap_acl_plugin: Plugin acl must be loaded also (you must set: mail_plugins=$mail_plugins acl) Apr 18 21:57:05 imap: Fatal: Couldn't load required plugins

2 4

Installing fts-solr on dovecot (centos 6) - [request for help]
by Kevin Laurie 18 Apr '15

18 Apr '15

Hello, I have been trying to get full-text-search on dovecot. I followed the tutorial on this site:- https://extremeshok.com/6622/enabling-apache-solr-4-10-using-jetty-with-dov… The instruction on the page here seems wrong:- sed -i -e 's|mail_plugins = quota|mail_plugins = quotann# Enable fts fts_solr plugin globally for Solr Full Text Search Indexingnmail_plugins = $mail_plugins fts fts_solrnnplugin {nfts = solrn#break-imap-search will use solr for indexing TEXT and BODY searches.nfts_solr = break-imap-search url=http://127.0.0.1:8983/solr/nfts_autoindex = yesn}|' /etc/dovecot.conf I would appreciate if someone could help correct the parameters for the dovecot.conf output shown below. Please help. [root@mail tmp]# cat /etc/dovecot/dovecot.conf # Listen addresses. # - '*' means all available IPv4 addresses. # - '[::]' means all available IPv6 addresses. # Listen on all available addresses by default listen = * [::] #base_dir = /var/run/dovecot mail_plugins = quotann# Enable fts fts_solr plugin globally for Solr Full Text Search Indexingnmail_plugins = $mail_plugins fts fts_solrnnplugin {nfts = solrn#break-imap-search will use solr for indexing TEXT and BODY searches.nfts_solr = break-imap-search url=http://127.0.0.1:8983/solr/nfts_autoindex = yesn} acl # Enabled mail protocols. protocols = pop3 imap sieve lmtp # User/group who owns the message files: mail_uid = 2000 mail_gid = 2000 # Assign uid to virtual users. first_valid_uid = 2000 last_valid_uid = 2000 # Logging. Reference: http://wiki2.dovecot.org/Logging log_path = /var/log/dovecot.log mail_debug = no auth_verbose = no auth_debug = no auth_debug_passwords = no # Possible values: no, plain, sha1. auth_verbose_passwords = no # SSL: Global settings. # Refer to wiki site for per protocol, ip, server name SSL settings: # http://wiki2.dovecot.org/SSL/DovecotConfiguration ssl_protocols = !SSLv2 !SSLv3 ssl = required verbose_ssl = no #ssl_ca =</path/to/ca ssl_cert = </etc/pki/tls/certs/iRedMail.crt ssl_key = </etc/pki/tls/private/iRedMail.key # With disable_plaintext_auth=yes AND ssl=required, STARTTLS is mandatory. # Set disable_plaintext_auth=no AND ssl=yes to allow plain password transmitted # insecurely. disable_plaintext_auth = yes # Allow plain text password per IP address/net #remote 192.168.0.0/24 { # disable_plaintext_auth = no #} # Mail location and mailbox format. mail_location = maildir:/%Lh/Maildir/:INDEX=/%Lh/Maildir/ # Authentication related settings. # Append this domain name if client gives empty realm. auth_default_realm = # Authentication mechanisms. auth_mechanisms = PLAIN LOGIN # Limits the number of users that can be logging in at the same time. # Default is 100. # Note: this value can be overrided by "process_limit =" in service protocol. # e.g. # protocol imap-login { # ... # process_limit = 500 # } #default_process_limit = 100 service auth { unix_listener /var/spool/postfix/private/dovecot-auth { user = postfix group = postfix mode = 0666 } unix_listener auth-master { user = vmail group = vmail mode = 0666 } unix_listener auth-userdb { user = vmail group = vmail mode = 0660 } } # LMTP server (Local Mail Transfer Protocol). # Reference: http://wiki2.dovecot.org/LMTP service lmtp { user = vmail # For higher volume sites, it may be desirable to increase the number of # active listener processes. A range of 5 to 20 is probably good for most # sites. process_min_avail = 5 # Logging. # Require 'info_log_path =' in 'protocol lmtp {}' block. executable = lmtp -L # Listening on socket file and TCP unix_listener /var/spool/postfix/private/dovecot-lmtp { user = postfix group = postfix mode = 0600 } inet_listener lmtp { #address = 192.168.0.24 127.0.0.1 ::1 port = 24 } } # Virtual mail accounts. userdb { args = /etc/dovecot/dovecot-mysql.conf driver = sql } passdb { args = /etc/dovecot/dovecot-mysql.conf driver = sql } # Master user. # Master users are able to log in as other users. It's also possible to # directly log in as any user using a master password, although this isn't # recommended. # Reference: http://wiki2.dovecot.org/Authentication/MasterUsers auth_master_user_separator = * passdb { driver = passwd-file args = /etc/dovecot/dovecot-master-users master = yes } plugin { auth_socket_path = /var/run/dovecot/auth-master quota = dict:user::proxy::quotadict quota_rule = *:storage=1G #quota_rule2 = *:messages=0 #quota_rule3 = Trash:storage=1G #quota_rule4 = Junk:ignore # Quota warning. # If user suddenly receives a huge mail and the quota jumps from # 85% to 95%, only the 95% script is executed. quota_warning = storage=85%% quota-warning 85 %u quota_warning2 = storage=90%% quota-warning 90 %u quota_warning3 = storage=95%% quota-warning 95 %u # Plugin: autocreate. Create and subscribe to default IMAP folders. autocreate = INBOX autocreate2 = Sent autocreate3 = Trash autocreate4 = Drafts autocreate5 = Junk autosubscribe = INBOX autosubscribe2 = Sent autosubscribe3 = Trash autosubscribe4 = Drafts autosubscribe5 = Junk # Plugin: expire. #expire = Trash 7 Trash/* 7 Junk 30 #expire_dict = proxy::expire # ACL and share folder acl = vfile acl_shared_dict = proxy::acl # By default Dovecot doesn't allow using the IMAP "anyone" or # "authenticated" identifier, because it would be an easy way to spam # other users in the system. If you wish to allow it, #acl_anyone = allow # Pigeonhole managesieve service. # Reference: http://wiki2.dovecot.org/Pigeonhole/Sieve/Configuration # Per-user sieve settings. sieve_dir = /%Lh/sieve sieve = /%Lh/sieve/dovecot.sieve # Global sieve settings. sieve_global_dir = /var/vmail/sieve # Note: if user has personal sieve script, global sieve rules defined in # sieve_default will be ignored. Please use sieve_before or # sieve_after instead. #sieve_default = sieve_before = /var/vmail/sieve/dovecot.sieve #sieve_after = # The maximum number of redirect actions that can be performed during a # single script execution. The meaning of 0 differs based on your version. # For versions v0.3.0 and beyond this means that redirect is prohibited. # For older versions, however, this means that the number of redirects is # unlimited, so be careful. #sieve_max_redirects = 4 } service quota-warning { executable = script /usr/local/bin/dovecot-quota-warning.sh unix_listener quota-warning { user = vmail group = vmail mode = 0660 } } service dict { unix_listener dict { mode = 0660 user = vmail group = vmail } } dict { #expire = db:/var/lib/dovecot/expire/expire.db quotadict = mysql:/etc/dovecot/dovecot-used-quota.conf acl = mysql:/etc/dovecot/dovecot-share-folder.conf } protocol lda { # Reference: http://wiki2.dovecot.org/LDA mail_plugins = $mail_plugins sieve autocreate auth_socket_path = /var/run/dovecot/auth-master log_path = /var/log/dovecot-sieve.log lda_mailbox_autocreate = yes postmaster_address = root } protocol lmtp { # Log file info_log_path = /var/log/dovecot-lmtp.log # Plugins mail_plugins = quotann# Enable fts fts_solr plugin globally for Solr Full Text Search Indexingnmail_plugins = $mail_plugins fts fts_solrnnplugin {nfts = solrn#break-imap-search will use solr for indexing TEXT and BODY searches.nfts_solr = break-imap-search url=http://127.0.0.1:8983/solr/nfts_autoindex = yesn} sieve postmaster_address = postmaster lmtp_save_to_detail_mailbox = yes recipient_delimiter = + } protocol imap { mail_plugins = $mail_plugins imap_quota autocreate imap_acl imap_client_workarounds = tb-extra-mailbox-sep # Maximum number of IMAP connections allowed for a user from each IP address. # NOTE: The username is compared case-sensitively. # Default is 10. # Increase it to avoid issue like below: # "Maximum number of concurrent IMAP connections exceeded" mail_max_userip_connections = 20 } protocol pop3 { mail_plugins = $mail_plugins pop3_client_workarounds = outlook-no-nuls oe-ns-eoh pop3_uidl_format = %08Xu%08Xv # Maximum number of IMAP connections allowed for a user from each IP address. # NOTE: The username is compared case-sensitively. # Default is 10. mail_max_userip_connections = 20 } # Login processes. Refer to Dovecot wiki for more details: # http://wiki2.dovecot.org/LoginProcess service imap-login { service_count = 1 # To avoid startup latency for new client connections, set process_min_avail # to higher than zero. That many idling processes are always kept around # waiting for new connections. #process_min_avail = 0 # number of simultaneous IMAP connections #process_limit = $default_process_limit process_limit = 500 # vsz_limit should be fine at its default 64MB value #vsz_limit = 64M } service pop3-login { service_count = 1 # number of simultaneous POP3 connections #process_limit = 500 } namespace { type = private separator = / prefix = #location defaults to mail_location. inbox = yes } namespace { type = shared separator = / prefix = Shared/%%u/ location = maildir:/%%Lh/Maildir/:INDEX=/%%Lh/Maildir/Shared/%%u # this namespace should handle its own subscriptions or not. subscriptions = yes list = children } # Public mailboxes. # Refer to Dovecot wiki page for more details: # http://wiki2.dovecot.org/SharedMailboxes/Public #namespace { # type = public # separator = / # prefix = Public/ # # # CONTROL=: Mark this public folder as read-only mailbox # # INDEX=: Per-user \Seen flag # location = maildir:/var/vmail/public/:CONTROL=~/Maildir/public:INDEX=~/Maildir/public # # # Allow users to subscribe to the public folders. # subscriptions = yes #}

2 4

Please help: error after upgrade to version 2.1.16
by Harald Langner 18 Apr '15

18 Apr '15

Hallo I can not find a forum at dovecot.org and I get a problem I can not solve. After Updating to the version dovecot2 2.1.16 I can no more get eMails with my eMail-client. All has been working fine before. Server: FreeBSD 10.0-RELEASE-p18, with perl 5, version 18, subversion 4 (v5.18.4) It seems it is an authentication problem with my server. The errors are: #cat dovecot.log Apr 17 22:19:37 imap-login: Error: Timeout waiting for handshake from auth server. my pid=41810, input bytes=0 Apr 17 22:19:58 auth: Error: auth: environment corrupt; missing value for DOVECOT_ Apr 17 22:19:58 auth: Fatal: unsetenv(RESTRICT_SETUID) failed: Bad address Apr 17 22:19:58 master: Error: service(auth): command startup failed, throttling for 60 secs Apr 17 22:24:04 auth: Error: auth: environment corrupt; missing value for DOVECOT_ Apr 17 22:24:04 auth: Fatal: unsetenv(RESTRICT_SETUID) failed: Bad address Apr 17 22:24:04 master: Error: service(auth): command startup failed, throttling for 60 secs I have google and has nothing found about "..environment corrupt; missing value for DOVECOT_" and about "auth: Fatal: unsetenv(RESTRICT_SETUID) failed: Bad address" I have make a reinstall - but doesn't help. I get the same error. I have not forget to create new certs with the dovecote shell-script after installation. I'm using passwd (virtual users). Make a cat on passwd shows that it is not empty. Also the date of the file show that the update installation has it not changed. So I have not create the dovecot users again. here are some other logs: #cat dovecot-info.log Apr 17 22:29:03 imap-login: Info: Disconnected: Auth process broken (disconnected before auth was ready, waited 1 secs): user=<>, rip=85.181.222.126, lip=78.47.225.20, TLS handshaking Apr 17 22:29:33 imap-login: Info: Disconnected: Auth process broken (disconnected before auth was ready, waited 30 secs): user=<>, rip=85.181.222.126, lip=78.47.225.20, TLS Apr 17 22:29:33 imap-login: Info: Disconnected: Auth process broken (disconnected before auth was ready, waited 30 secs): user=<>, rip=85.181.222.126, lip=78.47.225.20, TLS #cat dovecot-debug.log Apr 17 22:30:03 auth: Debug: Loading modules from directory: /usr/local/lib/dovecot/auth Apr 17 22:30:03 auth: Debug: Read auth token secret from /var/run/dovecot//auth-token-secret.dat Apr 17 22:34:01 auth: Debug: Loading modules from directory: /usr/local/lib/dovecot/auth Apr 17 22:34:01 auth: Debug: Read auth token secret from /var/run/dovecot//auth-token-secret.dat Apr 17 22:34:01 imap-login: Debug: SSL: where=0x10, ret=1: before/accept initialization [85.181.222.126] Apr 17 22:34:01 imap-login: Debug: SSL: where=0x2001, ret=1: before/accept initialization [85.181.222.126] Apr 17 22:34:01 imap-login: Debug: SSL: where=0x2001, ret=1: SSLv3 read client hello A [85.181.222.126] Apr 17 22:34:01 imap-login: Debug: SSL: where=0x2001, ret=1: SSLv3 write server hello A [85.181.222.126] Apr 17 22:34:01 imap-login: Debug: SSL: where=0x2001, ret=1: SSLv3 write certificate A [85.181.222.126] Apr 17 22:34:01 imap-login: Debug: SSL: where=0x2001, ret=1: SSLv3 write key exchange A [85.181.222.126] Apr 17 22:34:01 imap-login: Debug: SSL: where=0x2001, ret=1: SSLv3 write server done A [85.181.222.126] Apr 17 22:34:01 imap-login: Debug: SSL: where=0x2001, ret=1: SSLv3 flush data [85.181.222.126] Apr 17 22:34:01 imap-login: Debug: SSL: where=0x2001, ret=1: SSLv3 read client certificate A [85.181.222.126] Apr 17 22:34:01 imap-login: Debug: SSL: where=0x2002, ret=-1: SSLv3 read client key exchange A [85.181.222.126] Apr 17 22:34:01 imap-login: Debug: SSL: where=0x2002, ret=-1: SSLv3 read client key exchange A [85.181.222.126] Apr 17 22:34:01 imap-login: Debug: SSL: where=0x2002, ret=-1: SSLv3 read client key exchange A [85.181.222.126] Apr 17 22:34:01 imap-login: Debug: SSL: where=0x2002, ret=-1: SSLv3 read client key exchange A [85.181.222.126] ######################################################################################## My configuration is sendmail(MTA) -> procmail(LDA) -> dovecot(IMAP) with TLS and Maildir (no DB) Authentification been done with dovecot password file (no real user, no OpenLDAP, no other DB-User) #dovecot -n # 2.2.16: /usr/local/etc/dovecot/dovecot.conf # OS: FreeBSD 10.0-RELEASE-p18 amd64 ufs auth_debug = yes auth_mechanisms = digest-md5 plain login auth_verbose = yes auth_verbose_passwords = plain base_dir = /var/run/dovecot/ debug_log_path = /var/log/dovecot-debug.log default_internal_user = vmail default_login_user = vmail deliver_log_format = msgid=%m: %$ %f %s disable_plaintext_auth = no first_valid_uid = 1000 hostname = swdevil.de info_log_path = /var/log/dovecot-info.log lda_mailbox_autocreate = yes lda_mailbox_autosubscribe = yes log_path = /var/log/dovecot.log login_greeting = IMAPd ready. login_log_format_elements = user=<%u> method=%m rip=%r lip=%l mpid=%e %c mail_access_groups = mailnull mail_debug = yes mail_location = maildir:/home/vmail/%d/%n/:INBOX=/home/vmail/%d/%n/.INBOX mail_plugins = " virtual" mail_temp_dir = /tmp/mail namespace inbox { inbox = yes location = prefix = } passdb { args = scheme=DIGEST-MD5 username_format=%n /usr/local/etc/dovecot/pass driver = passwd-file } service auth-worker { group = wheel user = root } service imap-login { group = dovenull inet_listener imap { port = 0 } inet_listener imaps { port = 993 } } service imap { process_limit = 100 } service pop3-login { group = dovenull inet_listener pop3 { port = 0 } inet_listener pop3s { port = 0 } } service pop3 { process_limit = 100 } ssl = required ssl_cert = </usr/local/etc/dovecot/certs/dovecot_ssl_crt.pem ssl_key = </usr/local/etc/dovecot/certs/dovecot_ssl_key.pem userdb { args = uid=vmail gid=vmail home=/home/vmail/%d/%n driver = static } verbose_proctitle = yes verbose_ssl = yes protocol pop3 { pop3_uidl_format = %08Xu%08Xv } Many thanks for Your advice what could be wrong. Harald Langner EU (Germany)

2 3

Problem: mail moved by thunderbird script is invisible to mail clients, but in cur directory
by David Gessel 18 Apr '15

18 Apr '15

Over the last year I've had a script moving old mail (120 days) into my annual archive folder. This is the first year I've done this with Dovecot, previously it was running against Cyrus. There's nothing particularly clever: a few conditions to match, then "move message to" the appropriate archive folder. There's one for every year from 2000 to 2015. 2015 is just barely ahead of need. 2014 has about a year's mail in the cur directory. The 2000-2013 folders were filled by Cyrus and were migrated over using IMAP Migrate. They're fine, and read normally. The 2014 layout looks normal to me # ls cur dovecot-uidlist dovecot.index.cache dovecot.index.log.2 new dovecot-keywords dovecot.index dovecot.index.log maildirfolder tmp Permissions are the same as every other folder, as is owner: drw-r----- 2 vmail vmail 9.6K Apr 12 21:13 cur and # ls | wc -l 9822 I've checked with Thunderbird, Mulberry, Claws, and Sylpheed - none can read the directory. The files look normal: 2014/cur 1426411329.M123928P26360.host.domain.com,S=3523,W=3591:2,R More or less the same as a working directory: 2013/cur 1405500734.M958596P27867.host.domain.com,S=794,W=819:2,RS I've run # doveadm force-resync -u user .archives.2014 and nothing changed. I'm at a bit of a loss since no client can read them, something like moving them to another folder and back is a little complicated. Any hints?

3 3

ManageSieve Dovecot v2 listen on localhost only
by trash＠skrilnetz.net 17 Apr '15

17 Apr '15

Hi, How can I only listen on localhost for ManageSieve? I tried: port = localhost:4190 still listening *: tcp 0 0 0.0.0.0:4190 0.0.0.0:* LISTEN 0 515675 20540/dovecot Would did I not get here? Thanks,

3 5

Replace autocreate after upgrading
by trash＠skrilnetz.net 17 Apr '15

17 Apr '15

Hi, I just upgraded to 2.2.9 and found out that autocreate should not be used any more. I had a look at http://wiki2.dovecot.org/MailboxSettings and I tried to replace my old config but I had no success. Would somebody be so and help me to change my config? Here is my old config: http://pastebin.com/zFUAQmV3 Thanks,

2 1

Potentially breaking dict-proxy (dict-sql) backwards compatibility
by Timo Sirainen 17 Apr '15

17 Apr '15

Looks like the dict-proxy code doesn't currently do escaping newlines properly, but it still accidentally happens to work, because the data is stored in the escaped form. I'm thinking about fixing this, but this might break somebody's existing dict usage. But then again maybe nobody is actually using it now, especially because it hasn't been working exactly as expected. So, can anybody tell me if they're currently using a combination of: - dict proxy (especially to dict sql) - containing values which can contain LFs (or TABs) I guess this mainly means storing Sieve scripts or IMAP METADATA to SQL. Or maybe somebody is using dict (via proxy) for their own purposes?..

1 0

Calendar and address book with Dovecot
by mimicafe＠gmail.com 16 Apr '15

16 Apr '15

Hi guys Thanks for all your input. I'll feedback later... Mimi

1 0

Thunderbird sync time? (reverse quota warning)
by E.B. 16 Apr '15

16 Apr '15

For reverse quota warning, it looks like webmail works nice. quota_warning3 = -storage=100%% quota-warning below %u # user is no longer over quota But using thunderbird I deleted enough messages to go below quota and I deleted them from trash folder too. But mail log does not show thunderbird connecting to imap to actually delete mails and get the trigger below quota warning msg. It's i thinks a thundrbrd behavior but i wonder if anyone on this list knows how it works? Do i just keep waiting for it to sync eventually? or??????? TIA!

2 3

Dovecot and recipient_delimiter
by J. Echter 16 Apr '15

16 Apr '15

Hi, we're using thunderbird as our client, it has the functionality to sort spamassassin tagged mails in a folder called 'Junk'. I have this folder on my dovecot server and i'd like to use the recipient_delimiter feature to get my spam/junk mails directly to this folder. what i have done yet: dovecot.conf: plugin { recipient_delimiter = + } postfix: master.cf dovecot unix - n n - - pipe flags=DRhu user=vmail:vmail null_sender= argv=/usr/libexec/dovecot/deliver -f ${sender} -d ${user}@${nexthop} -e -m ${extension} postfix: main.cf recipient_delimiter = + what i get: Apr 14 13:46:50 mule postfix/pickup[22664]: 71ED53C05EE: uid=0 from=<testuser(a)testdomain.test> Apr 14 13:46:50 mule postfix/cleanup[1408]: 71ED53C05EE: message-id=<552cfe2a.tR3wZK7y16RgA548%testuser(a)testdomain.test> Apr 14 13:46:50 mule postfix/qmgr[12559]: 71ED53C05EE: from=<testuser(a)testdomain.test>, size=465, nrcpt=2 (queue active) Apr 14 13:46:50 mule dovecot: lda(testuser(a)testdomain.test): msgid=<552cfe2a.tR3wZK7y16RgA548%testuser(a)testdomain.test>: save failed to junk: Mailbox doesn't exist: junk Apr 14 13:46:50 mule dovecot: lda(testuser(a)testdomain.test): msgid=<552cfe2a.tR3wZK7y16RgA548%testuser(a)testdomain.test>: saved mail to INBOX Apr 14 13:46:50 mule postfix/pipe[10898]: 71ED53C05EE: to=<testuser+Junk(a)testdomain.test>, relay=dovecot, delay=0.04, delays=0.02/0/0/0.02, dsn=2.0.0, status=sent (delivered via dovecot service) Apr 14 13:46:50 mule postfix/qmgr[12559]: 71ED53C05EE: removed here is my complete dovecot -n output: dovecot -n # 2.0.9: /etc/dovecot/dovecot.conf # OS: Linux 2.6.32-504.12.2.el6.x86_64 x86_64 CentOS release 6.6 (Final) ext4 auth_cache_negative_ttl = 0 auth_cache_size = 50 M auth_verbose = yes base_dir = /var/run/dovecot/ imap_id_log = * imap_id_send = * log_timestamp = "%Y-%m-%d %H:%M:%S " login_log_format_elements = user=<%u> method=%m rip=%r lip=%l mpid=%e %c %k mail_gid = 5000 mail_home = /DATEN/vmail/%d/%n mail_location = maildir:/DATEN/vmail/%d/%n/mail/ mail_plugins = " zlib" mail_uid = 5000 managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave passdb { args = /etc/dovecot/dovecot-ldap.conf driver = ldap } plugin { autocreate = Junk autosubscribe = Junk recipient_delimiter = + sieve = /DATEN/vmail/%d/%n/.dovecot.sieve sieve_dir = /DATEN/vmail/%d/%n/sieve zlib_save = gz zlib_save_level = 6 } protocols = sieve imap service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } unix_listener auth-userdb { group = vmail mode = 0660 user = vmail } user = root } service imap-login { chroot = login executable = /usr/libexec/dovecot/imap-login inet_listener imap { port = 0 } process_min_avail = 4 user = dovecot } service imap { executable = /usr/libexec/dovecot/imap } service managesieve-login { chroot = login user = dovecot } service pop3-login { chroot = login user = dovecot } ssl = required ssl_cert = </shared/config/dovecot/certs/dovecot.pem ssl_cipher_list = ALL:!LOW:!SSLv2:!EXP:!aNULL:!EXPORT ssl_key = </shared/config/dovecot/private/dovecot.pem userdb { args = /etc/dovecot/dovecot-ldap.conf driver = ldap } valid_chroot_dirs = /var/spool/vmail protocol lda { mail_plugins = sieve postmaster_address = postmaster } any hints on what i do wrong here? thanks juergen

2 4

Disk space usage with mdbox
by Alexandros Soumplis 15 Apr '15

15 Apr '15

Hello, I am using dovecot with mdbox+sis and I notice an ever increasing disk space usage since I converted mailboxes from Maildir to mdboxes. I have checked with a user and while it actually uses only 65K, his mdbox files on disk are more than 6G. The backup of his mailbox is just 64K. Any suggestions ? Below are some relevant commands: [root@mail ~]# doveadm quota get -u test Quota name Type Value Limit % User quota STORAGE 10135 31457280 0 User quota MESSAGE 186 - 0 [root@mail ~]# du -k --max-depth=1 /mdboxes/test/ 220 /mdboxes/test/mailboxes 6029348 /mdboxes/test/storage 6029592 /mdboxes/test/ [root@mail ~]# doveadm purge -u test [root@mail ~]# du -k --max-depth=1 /mdboxes/test/ 220 /mdboxes/test/mailboxes 6029348 /mdboxes/test/storage 6029592 /mdboxes/test/ [root@mail ~]# doveadm backup -u test mdbox:/tmp/MDBOX_TEMP/ [root@mail ~]# du -k --max-depth=1 /tmp/MDBOX_TEMP/ 16 /tmp/MDBOX_TEMP/mailboxes 65540 /tmp/MDBOX_TEMP/storage 65568 /tmp/MDBOX_TEMP/

4 9

setting service_count results in Permission denied
by Micah Anderson 15 Apr '15

15 Apr '15

The load on our machines has gotten too high, so I started to see log messages that directed me to look at this page for config changes: https://pad.riseup.net/redirect#http%3A//wiki2.dovecot.org/SocketUnavailable One of the things I wanted to do on that page was to set the: service imap { service_count = 100 } but when I added that to the service imap block, and restarted dovecot, I see this in the logs: Error: net_connect_unix(/run/dovecot/imap-postlogin) failed: Permission denied I dont understand how this impacts permissions. Its clearly this setting, because when I remove it, things work again. I found nothing else in the logs indicating a configuration problem. This is what the config block looked like: service imap { # Most of the memory goes to mmap()ing files. You may need to increase this # limit if you have huge mailboxes. #vsz_limit = 256M # Max. number of IMAP processes (connections) process_limit = 4096 service_count = 100 executable = imap imap-postlogin } service imap-postlogin { # the script process runs as the user specified here (v2.0.14+): #user = $default_internal_user executable = script-login /usr/local/sbin/postlogin_imap # this UNIX socket listener must use the same name as given to imap executable unix_listener imap-postlogin { } } This is with dovecot 2.2.13, thanks for any help you can provide! micah

4 3

concurrent IMAP connections (plus 2 easy questions)
by Ron Cleven 15 Apr '15

15 Apr '15

I posted a few days back asking about configuration issues with a modestly large number of IMAP connections. Several people were kind enough to respond with various ideas. Armed with those ideas and Google, I was able to determine the underlying configuration issues with CentOS 7 and Dovecot 2.2.10. I did some further benchmarking to ensure that we could properly plan our server configuration requirements as we continue to roll this out, so I thought I would share this, partly to see if anyone has experiences that conflict with my findings. I found that each incremental dovecot IMAP process required about 750k of RAM. Simulations confirmed that 8 gig of RAM was sufficient to support approximately 10,000 concurrent IMAP connections (no POP3). CentOS settings: Added: fs/inotify/max_user_instances = 28000 to: /etc/sysctl.d/99-sysctl.conf Added: * hard nproc 28000 * soft nproc 28000 * hard nofile 28000 * soft nofile 28000 to: /etc/security/limits.d/20-nproc.conf To verify the settings after reboot: cat /proc/sys/fs/inotify/max_user_instances ulimit -Hn ulimit -Sn Dovecot: Added: process_limit = 28000 to service imap{} /etc/dovecot/conf.d/10-master.conf Added (using proxies, would like to just turn off this check): mail_max_userip_connections = 40 to protocol imap {}: /etc/dovecot/conf.d/20-imap.conf Added: process_limit = 28000 to service managesieve {}: /etc/dovecot/conf.d/20-managesieve.conf Hope this helps someone. Feedback would be welcome. It would be great if there was a blessed cookbook for Dovecot scaling. At this point it seems a bit like an art form. Now to my two "easy" questions. 1) TCP replication between our two CentOS boxes has been working great, no complaints. However, I realized I did not know how to check the status of replications, as one might want to do if one of the two boxes was taken offline for maintenance or repair. On the surface, it would appear that the command: doveadm replicator status '*' would likely show me what I want to know. However, when I tried it, I got: doveadm(): Fatal: net_connect_unix(/var/run/dovecot/replicator-doveadm) failed: No such file or directory The documentation says that doveadm assumes the socket /var/run/dovecot/replicator-doveadm and the command format provides a "-a" override. In that directory, there is no "replicator-doveadm" socket, but I do see a "replicator" socket. So, should I be using the command: doveadm replicator status -a /var/run/dovecot/replicator '*' or is the non-existence of the replicator-doveadm socket indicative of something I might have done wrong with the config? I hate experimenting more than I have to with a production box. The 2.2.10 Dovecot I am running was installed via yum, so there are no potential compilation issues. 2) It seems logical to me that: dovecot stop would first lock out any new user connections, then do the equivalent of a: doveadm kick "*" before actually cycling everything else down to ensure the shutdown is as graceful as possible. I suppose I could experiment and find out for certain, but I have the sense that the "stop" command is not quite that elegant, so we have implemented procedures to work around it. Just a point of curiosity. An alternative would be if there was a doveadm command to lock out any new user connections, which could then be followed by kick and stop. I have found that many clients are VERY quick to reconnect after a kick.

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