- dovecot - dovecot.org

[Dovecot] Sort output of dovecot -n alphabetically?
by Charles Marcus 25 May '08

25 May '08

Is there a way? Postfix does this by default, and it makes it much less likely to miss/overlook a setting... If there is no way, any chance to modify it so that it does? Thanks for dovecot! Really looking forward to 1.1 release! -- Best regards, Charles

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[Dovecot] dovecot developer documentation
by Piotr Wadas 25 May '08

25 May '08

Hello, I want to create some specific plugin for dovecot v1.1 (rc5). Where can I find some developer documentation ? Can I build my plugin separately, or do I need to rebuild dovecot again ? I'm looking into code, and analyzing some simple plugins, but hooks documentation or any hints you could give would be very helpful.. AFAIK there's no search for mailing list archives available, to let me search for some older guidance in this case :( Regards, Piotr

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[Dovecot] singe system user for all virtual users
by Wojtek Bogusz 25 May '08

25 May '08

hi, i would like to have all the emails stored under one system user and system group. i keep user passwords in LDAP. for userdb i wanted to use static. but i keep getting this error: Error: Error in configuration file /usr/local/etc/dovecot.conf line 909: Unknown setting: userdb Fatal: Invalid configuration in /usr/local/etc/dovecot.conf i am using version 1.0.13 my /usr/local/etc/dovecot.conf without comments is: base_dir = /var/run/dovecot/ protocols = imaps imap listen = * disable_plaintext_auth = no shutdown_clients = yes log_timestamp = "%Y-%m-%d %H:%M:%S " ssl_disable = no ssl_cert_file = /etc/apache2/ssl/server.pem ssl_key_file = /etc/apache2/ssl/server.key mail_location = maildir:/home/MAIL/%n mail_privileged_group = mail protocol imap { login_greeting_capability = yes imap_client_workarounds = tb-extra-mailbox-sep } protocol lda { postmaster_address = postmaster(a)frontlinedefenders.org hostname = base auth_socket_path = /var/run/dovecot/auth-master } auth_verbose = yes auth_debug = yes auth_debug_passwords = yes auth default { mechanisms = plain passdb ldap { args = /etc/dovecot/dovecot-ldap.conf } userdb static { args = uid=mail gid=mail home=/home/MAIL/%n } auth_userdb = user = mail socket listen { master { path = /var/run/dovecot/auth-master mode = 0600 user = mail # User running Dovecot LDA group = mail # Or alternatively mode 0660 + LDA user in this group } } } dict { } plugin { } what do i do wrong? best regards, Wojtek

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[Dovecot] Error while set mailQuota=0 with mbox and LDAP backend
by Zhang Huangbin 25 May '08

25 May '08

Hi, all. I have OpenLDAP(+qmail.schema), Dovecot, Postfix installed on RHEL 5.1 (x86_64), and they works fine with mbox format. The problem is if i set 'mailQuota=0' in LDAP, postfix can't send mail to recipient user. But it works fine with 'mailQuota != 0', such as '10240'(10M). What's wrong with my mail server setting? How can i solved this issue? Thanks very much. Bellow is the mail log from /var/log/maillog: ---------------- /var/log/maillog ------------- # mail -s "h" postmaster(a)a.cn < /etc/hosts && tail -0f /var/log/maillog May 23 20:29:35 rh6 postfix/pickup[1608]: 8E8B884949: uid=0 from=<root> May 23 20:29:35 rh6 postfix/cleanup[1896]: 8E8B884949: message-id=<20080524002935.8E8B884949(a)rh6.bibby.org> May 23 20:29:35 rh6 postfix/qmgr[1616]: 8E8B884949: from=<root(a)rh6.bibby.org>, size=467, nrcpt=1 (queue active) May 24 00:29:35 rh6 postfix/smtpd[1901]: connect from localhost.localdomain[127.0.0.1] May 24 00:29:35 rh6 postfix/smtpd[1901]: CFE838494A: client=localhost.localdomain[127.0.0.1] May 23 20:29:35 rh6 postfix/cleanup[1896]: CFE838494A: message-id=<20080524002935.8E8B884949(a)rh6.bibby.org> May 23 20:29:35 rh6 postfix/qmgr[1616]: CFE838494A: from=<root(a)rh6.bibby.org>, size=1076, nrcpt=1 (queue active) May 24 00:29:35 rh6 postfix/smtpd[1901]: disconnect from localhost.localdomain[127.0.0.1] May 24 00:29:35 rh6 postfix/smtp[1898]: 8E8B884949: to=<postmaster(a)a.cn>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.35, delays=0.07/0/0.01/0.27, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as CFE838494A) May 23 20:29:35 rh6 postfix/qmgr[1616]: 8E8B884949: removed May 23 20:29:35 rh6 postfix/pickup[1608]: E47BA84949: uid=2000 from=<> May 23 20:29:35 rh6 postfix/cleanup[1896]: E47BA84949: message-id=<dovecot-1211588975-866451-0(a)rh6.bibby.org> May 23 20:29:35 rh6 postfix/qmgr[1616]: E47BA84949: from=<>, size=2085, nrcpt=1 (queue active) May 23 20:29:35 rh6 postfix/pipe[1902]: CFE838494A: to=<postmaster(a)a.cn>, relay=dovecot, delay=0.12, delays=0.01/0/0/0.11, dsn=2.0.0, status=sent (delivered via dovecot service) May 23 20:29:35 rh6 postfix/qmgr[1616]: CFE838494A: removed May 24 00:29:36 rh6 postfix/smtpd[1901]: connect from localhost.localdomain[127.0.0.1] May 24 00:29:36 rh6 postfix/smtpd[1901]: 390468494F: client=localhost.localdomain[127.0.0.1] May 23 20:29:36 rh6 postfix/cleanup[1896]: 390468494F: message-id=<dovecot-1211588975-866451-0(a)rh6.bibby.org> May 23 20:29:36 rh6 postfix/qmgr[1616]: 390468494F: from=<>, size=2522, nrcpt=1 (queue active) May 24 00:29:36 rh6 postfix/smtpd[1901]: disconnect from localhost.localdomain[127.0.0.1] May 24 00:29:36 rh6 postfix/smtp[1898]: E47BA84949: to=<root(a)rh6.bibby.org>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.34, delays=0.02/0/0.01/0.31, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 390468494F) May 23 20:29:36 rh6 postfix/qmgr[1616]: E47BA84949: removed May 23 20:29:36 rh6 postfix/local[1951]: 390468494F: to=<root(a)rh6.bibby.org>, relay=local, delay=0.04, delays=0.01/0/0/0.03, dsn=4.3.0, status=deferred (temporary failure. Command output: Can't open log file /var/log/sieve.log: Permission denied ) ------------ End maillog --------------- Bellow is my dovecot setting(dovecot -n): ----------- dovecot -n -------------- # 1.0.13: /etc/dovecot.conf log_path: /var/log/dovecot.log protocols: pop3 pop3s imap imaps ssl_cert_file: /etc/pki/dovecot/certs/dovecotCert.pem ssl_key_file: /etc/pki/dovecot/private/dovecotKey.pem login_dir: /var/run/dovecot/login login_executable(default): /usr/libexec/dovecot/imap-login login_executable(imap): /usr/libexec/dovecot/imap-login login_executable(pop3): /usr/libexec/dovecot/pop3-login mail_location: mbox:/%Lh/%Ld/%Ln:INBOX=/%Lh/%Ld/%Ln/inbox:INDEX=MEMORY mbox_write_locks: dotlock fcntl mbox_min_index_size: 10240 mbox_very_dirty_syncs: yes mail_executable(default): /usr/libexec/dovecot/imap mail_executable(imap): /usr/libexec/dovecot/imap mail_executable(pop3): /usr/libexec/dovecot/pop3 mail_plugins(default): quota imap_quota mail_plugins(imap): quota imap_quota mail_plugins(pop3): quota mail_plugin_dir(default): /usr/lib64/dovecot/imap mail_plugin_dir(imap): /usr/lib64/dovecot/imap mail_plugin_dir(pop3): /usr/lib64/dovecot/pop3 pop3_client_workarounds(default): pop3_client_workarounds(imap): pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh auth default: mechanisms: plain login user: vmail passdb: driver: ldap args: /etc/dovecot-ldap.conf userdb: driver: ldap args: /etc/dovecot-ldap.conf socket: type: listen client: path: /var/spool/postfix/private/auth mode: 432 user: postfix group: postfix master: path: /var/run/dovecot/auth-master mode: 432 user: vmail group: vmail ----------- End dovecot -n -------------- Bellow is /etc/dovecot-ldap.conf: -------------- /etc/dovecot-ldap.conf --------------- hosts = 127.0.0.1:389 ldap_version = 3 auth_bind = yes dn = cn=vmail,dc=osspinc,dc=com dnpass = passwd base = o=%d,o=domains,dc=osspinc,dc=com scope = subtree deref = never user_filter = (&(mail=%u)(objectClass=qmailUser)(accountStatus=active)) pass_filter = (mail=%u) pass_attrs = userPassword=password user_global_uid = 2000 user_global_gid = 2000 default_pass_scheme = CRYPT user_attrs = homeDirectory=home,mailMessageStore=dirsize:mail,mailQuota=quota=dirsize:storage -------------- End /etc/dovecot-ldap.conf --------------- transport entry in Postfix master.cf: ----------- /etc/postfix/master.cf ---------------- dovecot unix - n n - - pipe flags=DRhu user=vmail:vmail argv=/usr/libexec/dovecot/deliver -d ${recipient} -f ${sender} ----------- End /etc/postfix/master.cf ---------------- -- Best Regards. Zhang Huangbin - Mail Server Solution for Red Hat(R) Enterprise Linux & CentOS 5.x: http://rhms.googlecode.com/

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[Dovecot] Auto-subscribe to folders
by Juan Asensio Sánchez 25 May '08

25 May '08

Hi I will use autocreate plugin in a new installation, and client has asked me if the users can be auto-subscribed to certain folders. Example: the users will have an autocreated Junk folder (for SPAM) and we want the users not to be un-subscribed for this folder; so if the user wants to be unsubscribed (from outlook, webmail, etc), there are two options: a) the action is rejected or denied; b) the next time he/she logins, then the folder is autosubscribed again. Could this be done? How? Thanks in advance.

2 1

[Dovecot] Domain variable in checkpassword
by sawyer x 25 May '08

25 May '08

Hello everyone I'm using the checkpassword method but I don't get the domain a user inputs. I can't cross check per virtual domains if I'm not getting one, which means it renders all my efforts useless. I've tried sending %d as a variable to my checkpassword script, but I'm just getting %d instead. This is a dump of my information: %ENV = { 'USERNAME_TRANSLATION' => '', 'SYSLOG_FACILITY' => '16', 'CACHE_SIZE' => '0', 'RESTRICT_GID_LAST' => '', 'TCPREMOTEIP' => '213.31.43.3', 'RESTRICT_GID_FIRST' => '', 'AUTH_NAME' => 'default', 'CACHE_TTL' => '3600', 'SERVICE' => 'IMAP', 'USERDB_1_DRIVER' => 'prefetch', 'USERNAME_CHARS' => 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890.-_@', 'DOVECOT_MASTER' => '1', 'RESTRICT_SETGID' => '', 'AUTH_WORKER_MAX_COUNT' => '30', 'AUTH_WORKER_PATH' => '/var/run/dovecot/auth-worker.25291', 'PASSDB_2_ARGS' => '/etc/exim/checkp %d', 'USERNAME_FORMAT' => '', 'LOCAL_IP' => '128.177.27.100', 'PASSDB_2_DRIVER' => 'checkpassword', 'PASSDB_1_DRIVER' => 'pam', 'REALMS' => '', 'PROTO' => 'TCP', 'ANONYMOUS_USERNAME' => 'anonymous', 'RESTRICT_SETEXTRAGROUPS' => '', 'TCPLOCALIP' => '128.177.27.100', 'LOG_TO_MASTER' => '1', 'MASTER_USER_SEPARATOR' => '', 'RESTRICT_SETUID' => '', 'REMOTE_IP' => '213.31.43.3', 'RESTRICT_USER' => '', 'DOVECOT_VERSION' => '1.0.rc15', 'MECHANISMS' => 'plain', 'RESTRICT_CHROOT' => '', 'DEFAULT_REALM' => '' }; ARGS: @ARGV = [ '%d', '/usr/libexec/dovecot/checkpassword-reply' ]; Thanks, Sawyer.

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[Dovecot] imap-login processes
by Bryan Polk 25 May '08

25 May '08

First, thanks for this great product. We migrated from Courier last week with only small bumps along the way. We have a few hundred active users with a mix of pop3 and imap clients. The server is running on sparc Solaris 9. We're seeing a problem now with the number of "imap-login" processes rising slowly to it's limit and then (understandably) not letting any more logins happen. Legitimate users seem to have no problem logging in until the limit is hit. Another odd thing is that this is not a problem for pop3-login processes, just imap... I've tried changing some obvious things including the passdb from pam to passwd and back again, but here's the current dovecot -n output: # 1.0.13: /opt/dovecot/etc/dovecot.conf protocols: imap imaps pop3 pop3s ssl_cert_file: /opt/dovecot/etc/ssl/certs/dovecot.pem ssl_key_file: /opt/dovecot/etc/ssl/certs/key.pem disable_plaintext_auth: no login_dir: /opt/dovecot/var/run/dovecot/login login_executable(default): /opt/dovecot/libexec/dovecot/imap-login login_executable(imap): /opt/dovecot/libexec/dovecot/imap-login login_executable(pop3): /opt/dovecot/libexec/dovecot/pop3-login login_processes_count: 12 login_max_processes_count: 512 verbose_proctitle: yes mail_location: maildir:~/Maildir mmap_disable: yes mail_executable(default): /opt/dovecot/libexec/dovecot/imap mail_executable(imap): /opt/dovecot/libexec/dovecot/imap mail_executable(pop3): /opt/dovecot/libexec/dovecot/pop3 mail_plugin_dir(default): /opt/dovecot/lib/dovecot/imap mail_plugin_dir(imap): /opt/dovecot/lib/dovecot/imap mail_plugin_dir(pop3): /opt/dovecot/lib/dovecot/pop3 pop3_uidl_format(default): pop3_uidl_format(imap): pop3_uidl_format(pop3): %08Xu%08Xv namespace: type: private prefix: INBOX. inbox: yes auth default: verbose: yes passdb: driver: pam userdb: driver: passwd Any ideas or advice? Thanks, Bryan Polk Unix Systems Administrator Communication and Multimedia Services FAMU-FSU College of Engineering bpolk(a)eng.fsu.edu

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[Dovecot] Problems with apple'mail client
by Osvaldo Alvarez Pozo 25 May '08

25 May '08

hi all I use dovecot for smtp authentication this works ok for thunderbird and for outlook express but not for apple'mail client. my config is as follow postfx main.cf . . #authentication smtpd_sasl_auth_enable = yes #smtpd_sasl_local_domain = $myhostname smtpd_sasl_exceptions_networks = $mynetworks smtpd_sasl_security_options = noanonymous broken_sasl_auth_clients = yes smtpd_sasl_type = dovecot smtpd_sasl_path = private/auth # TLS parameters . . Dovecot dovecot.conf ssl_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem ssl_key_file = /etc/ssl/private/ssl-cert-snakeoil.key mail_location = maildir:/var/vmail/%d/%u/Maildir mail_extra_groups = mail first_valid_uid = 5000 last_valid_uid = 5000 maildir_copy_with_hardlinks = yes disable_plaintext_auth = no mail_debug = no dotlock_use_excl=yes protocols = imap pop3 protocol imap { mail_plugins = quota imap_quota imap_client_workarounds = outlook-idle delay-newmail } protocol pop3 { mail_plugins = quota pop3_client_workarounds = outlook-no-nuls oe-ns-eoh pop3_uidl_format = %08Xu%08Xv } protocol lda { postmaster_address = support(a)oc3.fr mail_plugins = quota log_path = /var/log/dovecot-deliver.log info_log_path = /var/log/dovecot-deliver.log } auth default { mechanisms = plain login passdb sql { args = /usr/dovecot/etc/sql.conf } # userdb prefetch { # } userdb sql { args = /usr/dovecot/etc/sql.conf } user = nobody socket listen { master { path = /usr/dovecot/var/run/dovecot/auth-master mode = 0660 user = vmail group = mail } client { path = /var/spool/postfix/private/auth mode = 0660 user = postfix group = mail } } } dict { } plugin { } Thanks

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[Dovecot] Bug [1.1rc5]: Crash during "CPU architecture changed" index upgrade
by Cabel Sasser 25 May '08

25 May '08

Hello List, We just migrated from a PPC Xserve to an Intel Xserve. I used "rsync" to bring everyone's home directories over, and in the back of my mind wondered about how it would handle the binary index files... only one way to find out! :) Once I tried to login to IMAP, I got the following results: May 6 19:46:48 posh dovecot[1169]: IMAP(cabel): Rebuilding index file /Users/cabel/mail/.imap/INBOX/dovecot.index: CPU architecture changed May 6 19:46:48 posh dovecot[1169]: IMAP(cabel): fscking index file / Users/cabel/mail/.imap/INBOX/dovecot.index May 6 19:46:48 posh dovecot[1169]: IMAP(cabel): Fixed index file / Users/cabel/mail/.imap/INBOX/dovecot.index: log_file_seq 1 -> 637534208 May 6 19:46:48 posh dovecot[1169]: IMAP(cabel): /Users/cabel/ mail/.imap/INBOX/dovecot.index: log_file_head_offset too small May 6 19:46:48 posh dovecot[1169]: Panic: IMAP(cabel): file mail- transaction-log-view.c: line 215 (mail_transaction_log_view_set): assertion failed: (min_file_offset >= view->tail->hdr.hdr_size) May 6 19:46:48 posh dovecot[1169]: IMAP(cabel): Raw backtrace: 2 imap 0x000839d8 i_set_failure_file + 392 -> 3 imap 0x00083283 i_panic + 51 -> 4 imap 0x0006f512 mail_transaction_log_view_set + 1170 -> 5 imap 0x000669c9 mail_index_sync_map + 297 -> 6 imap 0x0005d35c mail_index_map + 1580 -> 7 imap 0x00061f5e mail_index_transaction_open_updated_view + 958 -> 8 imap 0x00062ba6 mail_index_sync_begin_to + 102 -> 9 imap 0x0006352d mail_index_sync_begin + 77 -> 10 imap 0x00030b50 mbox_sync + 1120 -> 11 imap 0x0003203d mbox_storage_sync_init + 77 -> 12 imap 0x0004f21f mailbox_sync + 31 -> 13 imap 0x00006167 cmd_select_full + 231 - > 14 imap 0x0000 May 6 19:46:48 posh dovecot[1169]: IMAP(cabel): 6329 cmd_select + 25 - > 15 imap 0x00008409 client_handle_unfinished_cmd + 201 -> 16 imap 0x000084ab client_handle_unfinished_cmd + 363 -> 17 imap 0x00008705 client_handle_unfinished_cmd + 965 -> 18 imap 0x00008962 client_input + 114 -> 19 imap 0x0008c2e9 io_loop_handler_run + 313 -> 20 imap 0x0008b606 io_loop_run + 70 -> 21 imap 0x000119f7 main + 1207 -> 22 imap 0x000016c6 start + 54 May 6 19:46:49 posh ReportCrash[1222]: Formulating crash report for process imap[1202] May 6 19:46:49 posh dovecot[1169]: child 1202 (imap) killed with signal 6 May 6 19:46:49 posh ReportCrash[1222]: Saved crashreport to /Library/ Logs/CrashReporter/imap_2008-05-06-194648_posh.crash using uid: 0 gid: 0, euid: 0 egid: 0 Naturally, deleting everyone's ".imap" folders fixed the problem. I'll attach the crash report to this e-mail. Hope this is useful to someone on this list! Best, Cabel Panic Process: imap [1202] Path: /usr/local/libexec/dovecot/imap Identifier: imap Version: ??? (???) Code Type: X86 (Native) Parent Process: dovecot [1169] Date/Time: 2008-05-06 19:46:48.366 -0700 OS Version: Mac OS X Server 10.5.2 (9C31) Report Version: 6 Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x0000000000000000, 0x0000000000000000 Crashed Thread: 0 Thread 0 Crashed: 0 libSystem.B.dylib 0x96d540ea __kill + 10 1 libSystem.B.dylib 0x96dcb3f2 raise + 26 2 libSystem.B.dylib 0x96dda9af abort + 73 3 imap 0x00083a0a i_internal_fatal_handler + 106 4 imap 0x00083283 i_panic + 51 5 imap 0x0006f512 mail_transaction_log_view_set + 1170 (mail-transaction-log-view.c:143) 6 imap 0x000669c9 mail_index_sync_map + 297 (mail-index-sync-update.c:753) 7 imap 0x0005d35c mail_index_map + 1580 (mail-index-map.c:926) 8 imap 0x00061f5e mail_index_sync_begin_init + 78 (mail-index-sync.c:355) 9 imap 0x00062ba6 mail_index_sync_begin_to + 102 (mail-index-sync.c:418) 10 imap 0x0006352d mail_index_sync_begin + 77 (mail-index-sync.c:323) 11 imap 0x00030b50 mbox_sync + 1120 (mbox- sync.c:1684) 12 imap 0x0003203d mbox_storage_sync_init + 77 (mbox-sync.c:1880) 13 imap 0x0004f21f mailbox_sync + 31 (mail- storage.c:539) 14 imap 0x00006167 cmd_select_full + 231 (cmd-select.c:39) 15 imap 0x00006329 cmd_select + 25 (cmd- select.c:88) 16 imap 0x00008409 client_command_input + 41 (client.c:553) 17 imap 0x000084ab client_command_input + 203 (client.c:604) 18 imap 0x00008705 client_handle_input + 277 (client.c:643) 19 imap 0x00008962 client_input + 114 (client.c:698) 20 imap 0x0008c2e9 io_loop_handler_run + 313 (ioloop-kqueue.c:150) 21 imap 0x0008b606 io_loop_run + 70 (ioloop.c:300) 22 imap 0x000119f7 main + 1207 (main.c:254) 23 imap 0x000016c6 start + 54 Thread 0 crashed with X86 Thread State (32-bit): eax: 0x00000000 ebx: 0x96dda96f ecx: 0xbfffdcdc edx: 0x96d540ea edi: 0x00201720 esi: 0x00000004 ebp: 0xbfffdcf8 esp: 0xbfffdcdc ss: 0x0000001f efl: 0x00000282 eip: 0x96d540ea cs: 0x00000007 ds: 0x0000001f es: 0x0000001f fs: 0x00000000 gs: 0x00000037 cr2: 0x00107000 Binary Images: 0x1000 - 0xa9fe0 +imap ??? (???) <10c13baf127aaaae5e5c68a2929781d2> /usr/local/libexec/dovecot/imap 0x8fe00000 - 0x8fe2da53 dyld 96.2 (???) <7af47d3b00b2268947563c7fa8c59a07> /usr/lib/dyld 0x9024c000 - 0x90340ff4 libiconv.2.dylib ??? (???) <c508c60fafca17824c0017b2e4369802> /usr/lib/libiconv.2.dylib 0x935d3000 - 0x935d7fff libmathCommon.A.dylib ??? (???) /usr/lib/ system/libmathCommon.A.dylib 0x93768000 - 0x9376ffe9 libgcc_s.1.dylib ??? (???) <a9ab135a5f81f6e345527df87f51bfc9> /usr/lib/libgcc_s.1.dylib 0x96ce5000 - 0x96e44ff3 libSystem.B.dylib ??? (???) <4899376234e55593b22fc370935f8cdf> /usr/lib/libSystem.B.dylib 0xffff0000 - 0xffff1780 libSystem.B.dylib ??? (???) /usr/lib/ libSystem.B.dylib

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[Dovecot] Maildir locking by LDA of dovecot
by Mike Grozak 25 May '08

25 May '08

Hi all! First of all, I want ti thank the whole Dovecot community (developers for developing and fast responses, users for populating and responses too). Dovecot is a really good and fast IMAP server - it serves near 3000 in our installation. Now I have a problem and request community's help its resolving;) Dovecot version: 1.0.13, compiled with vpopmail support. I have an account spam(a)domain.com (:-), in which we put all our spam (we gather statistic later). There can be 10 and more delivery attempts in a second to maildir of this account during the spam attacks on our server. The queue of our server can grow up to 20k messages, and all of these messages are sent to spam(a)domain.com. I found a lot of such strings in dovecot.log file during such DoS attack: dovecot.log:deliver(spam@domain.com): May 16 04:18:48 Info: msgid=<01c8b6da$a8bacf80$b7af2abe@sale>: save failed to INBOX: Timeout while waiting for lock dovecot.log:deliver(spam@domain.com): May 16 04:18:59 Info: msgid=<6611811842.20080516012444(a)poiusadfhnvxzmdiasdasgkhlsdkfg.com>: save failed to INBOX: Timeout while waiting for lock dovecot.log:deliver(spam@domain.com): May 16 04:20:06 Info: msgid=<01c8b6a8$7b552e00$a0a4034c@sale>: save failed to INBOX: Timeout while waiting for lock dovecot.log:deliver(spam@domain.com): May 16 04:20:14 Info: msgid=<360825920.32055246029506(a)mirgames.ru>: save failed to INBOX: Timeout while waiting for lock dovecot.log:deliver(spam@domain.com): May 16 04:20:50 Info: msgid=<01c8b6b1$0df9cb00$cc36dfc9@tek2>: save failed to INBOX: Timeout while waiting for lock dovecot.log:deliver(spam@domain.com): May 16 04:21:00 Info: msgid=<087901c7ca2d$ef272640$1e01a8c0(a)telefonia.InterCable.net>: save failed to INBOX: Timeout while waiting for lock dovecot.log:deliver(spam@domain.com): May 16 04:21:01 Info: msgid=<000701c8b6d2$01ff999f$c491aca7@snoueiij>: save failed to INBOX: Timeout while waiting for lock dovecot.log:deliver(spam@domain.com): May 16 04:22:32 Info: msgid=<000801c8b69b$060c0230$3cd8a4b7@cpbvlrx>: save failed to INBOX: Timeout while waiting for lock dovecot.log:deliver(spam@domain.com): May 16 04:22:45 Info: msgid=<000801c8b6a5$04ba6412$9910848d@aldldr>: save failed to INBOX: Timeout while waiting for lock dovecot.log:deliver(spam@domain.com): May 16 04:22:45 Info: msgid=<031401c772e2$adc5be40$1e01a8c0(a)mtu-net.ru>: save failed to INBOX: Timeout while waiting for lock dovecot.log:deliver(spam@domain.com): May 16 04:23:08 Info: msgid=<01c8b6db$0222fe80$b7af2abe@info>: save failed to INBOX: Timeout while waiting for lock What can I do for resolving this locks? The queue of my server becomes really big! May be, while looking into uidlist file, can dovecot LDA lock it? And other deliver processes can't open it and wait for him? $ dovecot --version 1.0.13 # dovecot -n # 1.0.13: /etc/dovecot.conf log_path: /var/log/dovecot.log protocols: imap pop3 ssl_disable: yes login_dir: /var/run/dovecot/login login_executable(default): /usr/libexec/dovecot/imap-login login_executable(imap): /usr/libexec/dovecot/imap-login login_executable(pop3): /usr/libexec/dovecot/pop3-login login_greeting: Server is ready. login_process_per_connection: no login_greeting_capability(default): yes login_greeting_capability(imap): yes login_greeting_capability(pop3): no login_max_connections: 1024 first_valid_uid: 39 last_valid_uid: 39 first_valid_gid: 39 last_valid_gid: 39 fsync_disable: yes maildir_copy_with_hardlinks: yes mail_executable(default): /usr/libexec/dovecot/imap mail_executable(imap): /usr/libexec/dovecot/imap mail_executable(pop3): /usr/libexec/dovecot/pop3 mail_plugins(default): quota imap_quota mail_plugins(imap): quota imap_quota mail_plugins(pop3): quota mail_plugin_dir(default): /usr/lib/dovecot/imap mail_plugin_dir(imap): /usr/lib/dovecot/imap mail_plugin_dir(pop3): /usr/lib/dovecot/pop3 auth default: mechanisms: plain login cram-md5 default_realm: tversu.ru cache_size: 10240 user: vpopmail username_format: %Lu passdb: driver: vpopmail args: cache_key=%u dovecot userdb: driver: vpopmail socket: type: listen client: path: /var/spool/postfix/private/auth mode: 438 user: postfix group: postfix master: path: /var/run/dovecot/auth-master mode: 438 plugin: quota: maildir:ignore=Trash --------------------------- WBR, Mike Grozak, TvSU IC

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