August 2014 - dovecot

Dovecot authentication LDAP SSL-TLS againts SAMBA4
by Lista de Dovecot 22 Aug '14

22 Aug '14

Hi, i would like to know if anybody have implemented the authentication of dovecot against samba4 via secure ldap (SSL/TLS). I made it but in plain text through dovecot´s offical page: http://wiki2.dovecot.org/AuthDatabase/LDAP/AuthBinds http://wiki2.dovecot.org/AuthDatabase/LDAP But when i try to do it in a secure way i can´t make it work. Samba4 is listening by port 636 and dovecot is speaking by 389 or 636, but they can´t comunicate themself. I´m wondering if any of you have done this before or have any clue that might help me. Thanks.

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Avoid "451 4.4.0 Remote server not answering (timeout while waiting for reply to DATA reply)"
by Florent Bautista 22 Aug '14

22 Aug '14

Hi all, I have a Dovecot setup (2.1, I will switch to 2.2 soon) with one Director and 2 backend servers. When my MX server (Postfix) tries to deliver mail to Dovecot via LMTP, it often gets an error "451 4.4.0 Remote server not answering (timeout while waiting for reply to DATA reply)" from the Director. Service LMTP is configured with "client_limit = 1" on Director en backends (others limits are default ones). Postfix is using "lmtp_destination_recipient_limit = 1" and "lmtp_destination_concurrency_limit = 1". I want that incoming messages are stored one after one per recipient (have a queue per recipient). I does not seem to be done actually. I think Postfix is sending too many messages at a time to Director. How do you do to handle that ? I already applied the 3 patches available on the list for 2.1, but it does not seem to solve my problem... Thank you a lot. Florent

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Folders don't show up
by Christian Hudon 22 Aug '14

22 Aug '14

Hello, I've upgraded to the new LTS version of Ubuntu. With that comes a new dovecot version. I think I've migrated my dovecot configuration correctly to the new version. Everything works, except that the mailboxes don't show up in the list of mailboxes in my mail clients. Trying to issue a LIST command, I see the following: CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE STARTTLS AUTH=PLAIN] Dovecot (Ubuntu) ready. 1 login USERNAME_HERE PASSWORD_HERE 1 OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS THREAD=ORDEREDSUBJECT MULTIAPPEND URL-PARTIAL CATENATE UNSELECT CHILDREN NAMESPACE UIDPLUS LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES WITHIN CONTEXT=SEARCH LIST-STATUS SPECIAL-USE BINARY MOVE] Logged in 2 LIST "" "*" * LIST (\HasNoChildren) " * LIST (\HasNoChildren) " [SNIP... A bunch of other identical lines... roughly as many as I have mailboxes] * LIST (\HasNoChildren) " * LIST (\HasNoChildren) " * LIST (\HasChildren) " 2 OK List completed. I'm not an IMAP protocol expert, but those answers to the list command don't quite look like valid IMAP to me. My imapdir has a bunch of maildir directories in it, like a normal imapdir should. Everything worked fine with the previous version of dovecot (1.2?). Maybe a dovecot bug? At least I don't see how my config could cause this. Any help would be appreciated. The output of "dovecot -n" is included below. Thanks in advance, Christian ----cut here---- # 2.2.9: /etc/dovecot/dovecot.conf # OS: Linux 3.13.0-34-generic i686 Ubuntu 14.04.1 LTS mail_location = maildir:~/IMAPdir:LAYOUT=imapdir mail_plugins = fts fts_squat passdb { args = scheme=SHA512-CRYPT username_format=%u /etc/dovecot/users driver = passwd-file } plugin { fts = squat fts_squat = partial=4 full=10 sieve = ~/.dovecot.sieve sieve_dir = ~/sieve } protocols = " imap" service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } } service imap { vsz_limit = 2 G } ssl_cert = </etc/ssl/certs/cert.pem ssl_cipher_list = ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!3DES:!MD5:!PSK ssl_dh_parameters_length = 2048 ssl_key = </etc/ssl/private/ssl.key ssl_prefer_server_ciphers = yes userdb { driver = passwd }

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Thunderbird not able to edit sieve Message Filters
by Peter Bell 22 Aug '14

22 Aug '14

I'm not sure when this problem first occurred - it is many months since I last editted a sieve filter. I am certainly several versions of Thunderbird and, probably, a few versions of Dovecot on from when I last editted a sieve filter. However, I do know that I have done so in the past. I have just built Dovecot 2.2.13 and Pigeonhole 0.4.3, installed and running on Slackware 14.1 x64. I am running an up-to-date version of Thunderbird (31.0) on Arch Linux x64. The sieve filters are definitely being applied to incoming mail, and working perfectly well. However, when I attempt to edit the Sieve Filters (from Thunderbird Tools->Sieve Message Filters...), the Sieve Filters tab is displayed, but not populated (eg, the Server Sieve Capabilities are not displayed, and there is an endless 'hourglass' displayed in the main mailfilters pane. Does anyone recognise the symptoms and can advise how to resolve the problem, or suggest what logs I should examine/post in order to identify the cause? -- ------------------------------------------------------------------- Peter Bell Mob: +63 (0) 9287 340 343 Tagum City, Philippines. Tel: +63 (0) 84 216 9037 email/msn: peter(a)bellfamily.org.uk Tel: +63 (0) 84 308 0002

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Assertion in istream.c::167 in POP3 mode when maildir content has wrong S value (using 2.2.13)
by Rolf Eike Beer 21 Aug '14

21 Aug '14

Hi, the affected machine is running 2.2.13 on Gentoo x86_64. For me it looks like the old size is still in some struct or whereever even after the file has been renamed. I see that there are many commits following 2.2.13, is that possibly already fixed or do I need to dig in the code? The original problem seems to be that maildrop uses the file size before piping the mail into spamassassin even if the mail is bigger afterwards. Not relevant here, but in case anyone wonders how this happens. Greetings, Eike Error: Cached message size smaller than expected (81118 < 81308) Error: Maildir filename has wrong S value, renamed the file from /var/vpopmail/domains/example.org/user/.maildir/cur/1408452738.16341.mail,S=81118:2, to /var/vpopmail/domains/example.org/user/.maildir/cur/1408452738.16341.mail,S=81308:2, Error: Corrupted index cache file /var/vpopmail/domains/example.org/user/.maildir/dovecot.index.cache: Broken physical size for mail UID 65 Panic: file istream.c: line 167 (i_stream_read): assertion failed: (old_size <= _stream->pos - _stream->skip) Error: Raw backtrace: /usr/lib64/dovecot/libdovecot.so.0(+0x6bbef) [0x7f50652a4bef] -> /usr/lib64/dovecot/libdovecot.so.0(+0x6bc4e) [0x7f50652a4c4e] -> /usr/lib64/dovecot/libdovecot.so.0(i_fatal+0) [0x7f506525e2be] -> /usr/lib64/dovecot/libdovecot.so.0(i_stream_read+0x214) [0x7f50652ad904] -> /usr/lib64/dovecot/libdovecot.so.0(i_stream_read_data+0x3d) [0x7f50652adfed] -> /usr/lib64/dovecot/libdovecot.so.0(message_get_body_size+0x9d) [0x7f5065299b3d] -> /usr/lib64/dovecot/libdovecot-storage.so.0(index_mail_init_stream+0x200) [0x7f506556f700] -> /usr/lib64/dovecot/libdovecot-storage.so.0(+0x2dd0f) [0x7f506553cd0f] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mail_get_stream+0x4b) [0x7f506554915b] -> /usr/lib64/dovecot/libdovecot-storage.so.0(+0x2dae7) [0x7f506553cae7] -> dovecot/pop3(client_create+0x56d) [0x40622d] -> dovecot/pop3() [0x404ea3] -> dovecot/pop3() [0x40508f] -> /usr/lib64/dovecot/libdovecot.so.0(+0x28346) [0x7f5065261346] -> /usr/lib64/dovecot/libdovecot.so.0(+0x28841) [0x7f5065261841] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_call_io+0x4e) [0x7f50652b58de] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0xd7) [0x7f50652b68b7] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run+0x9) [0x7f50652b5969] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_run+0x38) [0x7f50652b59e8] -> /usr/lib64/dovecot/libdovecot.so.0(master_service_run+0x13) [0x7f50652635a3] -> dovecot/pop3(main+0x233) [0x404bf3] -> /lib64/libc.so.6(__libc_start_main+0xf5) [0x7f5064eb6db5] -> dovecot/pop3() [0x404d49]

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About network throughput between Director and backends
by Listas＠Adminlinux 21 Aug '14

21 Aug '14

I plan to migrate my Dovecot IMAP servers to a clustered structure. I'm planning a cluster with high availability and load balancing. I know I need instances of Dovecot Proxy / Director. But these instances can be on another network? There is need for high network throughput between the Director and the backends? For me it would be cheaper to run Director in VM's at Amazon AWS for example. Thanks! -- Thiago Henrique

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doveadm proxy list
by Claus 21 Aug '14

21 Aug '14

Hi, i have configured my dovecot-proxy with "shutdown_clients = no" and "service_count = 1" for a "default_process_limit = 5000" and "default_client_limit = 25000". I don't know if this is a prefered setup for so many users/concurrent sessions but so i can reload my dovecot without disconnecting all sessions. The main problem are pop3 sessions - if i kill them, the mailbox remains locked and the client gets an error. Back to my problem: If i reload dovecot the "doveadm proxy list" shows me the list of the new processes. Is there any possibility to see the stats of the old sessions (user,source,destination) ? greet's Claus PS.: Could someone explain me why i have to set default_client_limit to 5x default_process_limit?

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rebuilding indexes for dovecot pop3
by Arkadiusz Miśkiewicz 21 Aug '14

21 Aug '14

Hi. doveadm -D fetch -u login \ 'imap.envelope imap.bodystructure size.virtual date.received' '*' according to mail archives allows to regenerate indexes and precache specified headers for imap usage. What headers are needed for dovecot pop3 daemon? I have one server where dovecot works for imap only. For pop3 there is different software being used. I want to migrate to dovecot pop3 but I need to precache and regenerate indexes for dovecot pop3. Note, some users used pop3 only, so dovecot imap had no chance to generate any indexes. Thanks, -- Arkadiusz Miśkiewicz, arekm / maven.pl

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Re: Frequent error: unknown namespace Trash
by Michael Ludwig 21 Aug '14

21 Aug '14

Hi Gedalya, I am very sorry for not having replied on-list. That was not my intention! I am not used to this behaviour of mailing lists, normally there is a reply-to field which points to the mailing list mail address. So do I have to use MAILBOX.Trash in 90-quota.conf ?? Or INBOX.Trash ? Cheers, Michael 2014-08-12 19:33 GMT+02:00 Gedalya <gedalya(a)gedalya.net>: > On 08/12/2014 09:28 AM, Michael Ludwig wrote: > >> prefix = INBOX. >> separator = . >> > Maybe that's it? It's therefore MAILBOX.Trash, not just Trash. > > You're supposed to reply on-list! Don't reply to gedalya(a)gedalya.net, > reply to dovecot(a)dovecot.org. If you want you can also cc the message > author, some people do that. > >

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Fatal: lazy_expunge: Unknown namespace: '.EXPUNGED/'
by Philipp Faeustlin 21 Aug '14

21 Aug '14

Hello List, with dovecot version 2.2.13.9, I actually have a problem using lazy_expunge and acl together. Shared/Public Folders work fine with lazy_expunge disabled. If lazy_expunge is enabled and userA got a shared folder form userB, then there is the error shown in subject. My test case to reproduce the error. doveadm mailbox list -u userA@domain --> Output Fine. doveadm acl set -u userB@domain INBOX user=userA@domain lookup read write write-seen write-deleted insert expunge create --> Fine. doveadm mailbox list -u userA@domain --> Some output and then: --> doveadm(userA@domain): Fatal: lazy_expunge: Unknown namespace: '.EXPUNGED/' I think this is a bug in dovecot, can someone of the dovecot developers or someone else confirm this? If it is not please show me the fault in my configuration. In May 2014 there was a thread with the same issue on this mailing list, but with no solution. http://dovecot.org/pipermail/dovecot/2014-May/096355.html Best regards Philipp Fäustlin --------------------------------------------- # 2.2.13.9 (19befd72d9d8): /etc/dovecot/dovecot.conf # OS: Linux 2.6.32-431.11.2.el6.x86_64 x86_64 Scientific Linux release 6.5 (Carbon) auth_debug = yes auth_mechanisms = plain login auth_socket_path = /var/run/dovecot/auth-userdb auth_username_format = %Ln auth_verbose = yes listen = * mail_debug = yes mail_gid = vmail mail_location = maildir:~/maildir mail_plugins = " acl lazy_expunge mail_log notify zlib notify replication" mail_shared_explicit_inbox = yes mail_uid = vmail 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 namespace { hidden = no ignore_on_failure = no inbox = no list = children location = maildir:%%h/maildir:INDEX=%h/Shared/%%u:CONTROL=%h/Shared/%%u prefix = Shared/%%u/ separator = / subscriptions = yes type = shared } namespace { location = maildir:/vmail/%d/public:INDEXPVT=~/index/%d/public prefix = Groups/ separator = / subscriptions = no type = public } namespace { hidden = yes list = no location = maildir:~/expunged prefix = .EXPUNGED/ separator = / subscriptions = no type = private } namespace inbox { inbox = yes list = yes location = mailbox Drafts { auto = subscribe special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { auto = subscribe special_use = \Trash } prefix = separator = / subscriptions = yes type = private } passdb { args = /etc/dovecot/dovecot-ldap.conf.ext driver = ldap } plugin { acl = vfile:/etc/dovecot/global-acls acl_shared_dict = file:/var/lib/dovecot/db/shared-mailboxes.db lazy_expunge = .EXPUNGED/ lazy_expunge_only_last_instance = yes mail_log_events = delete undelete expunge copy mailbox_delete mailbox_rename mail_log_fields = uid box msgid size mail_replica = tcps:mailhost1.rz.uni-hohenheim.de:12345 sieve = ~/.dovecot.sieve sieve_dir = ~/sieve zlib_save = gz zlib_save_level = 6 } protocols = imap pop3 lmtp sieve replication_dsync_parameters = -d -l 30 -U service aggregator { fifo_listener replication-notify-fifo { mode = 0666 user = vmail } unix_listener replication-notify { mode = 0666 user = vmail } } service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0666 user = postfix } unix_listener auth-userdb { group = vmail mode = 0660 user = vmail } } service doveadm { inet_listener { port = 12345 ssl = yes } } service imap-login { process_min_avail = 16 service_count = 0 } service imap-postlogin { executable = script-login /usr/local/bin/postlogin.sh user = $default_internal_user } service imap { executable = imap imap-postlogin process_limit = 8192 } service lmtp { unix_listener /var/spool/postfix/private/lmtp-dovecot { group = postfix user = postfix } } service managesieve-login { inet_listener sieve { port = 4190 } } service pop3-login { process_min_avail = 16 service_count = 0 } service pop3 { process_limit = 8192 } service replicator { process_min_avail = 1 unix_listener replicator-doveadm { group = vmail mode = 0660 } } ssl_cert = </etc/pki/dovecot/certs/dovecot.pem ssl_client_ca_file = /etc/openldap/cacerts/chain.pem ssl_key = </etc/pki/dovecot/private/dovecot.pem userdb { args = /etc/dovecot/dovecot-ldap.conf.ext driver = ldap } verbose_proctitle = yes protocol lmtp { mail_plugins = " acl lazy_expunge mail_log notify zlib notify replication sieve" } protocol imap { mail_plugins = " acl lazy_expunge mail_log notify zlib notify replication imap_acl imap_zlib" }

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