- dovecot - dovecot.org

[Dovecot] Solr clusters
by Timo Sirainen 07 Nov '13

07 Nov '13

Hi all, Has anyone implemented larger Dovecot+Solr clusters and would be willing to give some details about how it works for you? My understanding about it so far is: - SolrCloud isn’t usable with Dovecot. Replication isn’t useful, because nobody wants to pay for double the disk space for indexes that could be regenerated anyway. The autosharding isn’t very useful also, because: I think the shard keys could be created in two possible ways: a) Mails would be entirely randomly distributed across the cluster. This would make updates efficient, because the writes would be fully distributed across all servers. But I think it would also make reads somewhat inefficient, since all the servers would have to be searched and the results combined. Also if a server is lost, there’s no easy way to reindex back the missing data, because it would contain a piece of pretty much all the users’ data. b) Shard keys could be created so that the same user would typically go only to 1-2 servers. It would be possible (at least in theory) to find a broken server’s list of users and reindex only their data, but I’m not sure if this method is any easier than the non-SolrCloud setup. - Without SolrCloud you’d then need to shard the data manually. This would be easy enough to do by just assigning different users to different shards. But at some point the index is going to become too large and you need to add more shards and move some existing users to them. To keep the search performance good during the move, I guess this could be done with a script that does: 1) reindex user to new shard, 2) update userdb to point to new shard, 3) delete user from old shard, 4) doveadm fts rescan the user to remove any mails already deleted during the reindexing. - It seems that Solr index shouldn’t grow above 200 GB or the performance will be getting too bad? I’ve seen this in a few web pages. So each server should likely be running multiple separate Solr instances (shards). - http://www.hathitrust.org/blogs/large-scale-search/scaling-large-scale-sear… recommends NFS (or I guess any kind of a shared filesystem), which does seem to make sense. Since Dovecot wants to get instantly updated search results after indexing, I think it’s probably better not to separate the indexing and searching servers. - Would be interesting to know what kind of hardware your Solr servers currently have, how well they’re performing and what are the bottlenecks? From the above URL it appears that disk I/O is first, but if there’s enough of that available then CPU usage is second. I’m not quite sure where most of the memory goes - caching? - I’m guessing users are doing relatively few searches compared to how many new emails are being indexed/deleted all the time?

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[Dovecot] how to display dovecot.index.cache
by ldaamandy 07 Nov '13

07 Nov '13

hello dovecot(a)dovecot.org: I want to see the contents of dovecot.index.cache . Is there any command can make it become visible character displayed ? the command idxview can displayed doveoct.index and logview can dispalyed dovecot.index.log but it seems no command to displays dovecot.index.cache for us. thanks amandy

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[Dovecot] Postfix delivers mails to maildir and not to dovecot LDA for a virtual user
by Tru Pheenix 06 Nov '13

06 Nov '13

Hi I have been able to setup postfix and dovecot using postgres as the backend store with virtual user maps on Ubuntu 12.04 LTS Server. I have been following instructions from here: http://wiki2.dovecot.org/HowTo/DovecotPostgresql I haven't setup postfix to use saslauthd and PAM, instead I am using dovecot for SASL authentication. Rest of the table structures and query files are the same as from the wiki. SASL authentication works correctly for SMTP POP IMAP. I am able to send emails from a mail client such as Thunderbird with SASL authentication. However I am not able to receive emails for virtual users. I cannot figure out why. System users are getting their emails in the mail box correctly. Postfix fires the mailbox_command to hand over the mail to dovecot. This is how my *mail.log* looks when I send emails from an external domain: Nov 6 06:48:21 localhost postfix/smtpd[20053]: E075280C52: client= mail-ee0-f41.google.com[74.125.83.41] Nov 6 06:48:22 localhost postfix/cleanup[20064]: E075280C52: message-id=< CAJ+V0eCU891rSzSMVbcSy4zsRUk5GUp58b70Wv_WgZxLbKuyLw(a)mail.gmail.com> Nov 6 06:48:22 localhost postfix/qmgr[17492]: E075280C52: from=< me(a)gmail.com>, size=3124, nrcpt=1 (queue active) *Nov 6 06:48:22 localhost postfix/virtual[20066]: E075280C52: to=<someone(a)mydomain.com <someone(a)mydomain.com>>, relay=virtual, delay=0.85, delays=0.7/0.02/0/0.13, dsn=2.0.0, status=sent (delivered to maildir)* Nov 6 06:48:22 localhost postfix/qmgr[17492]: E075280C52: removed Nov 6 06:48:22 localhost postfix/smtpd[20053]: disconnect from mail-ee0-f41.google.com[74.125.83.41] Postfix seems to deliver the mail to maildir instead of the home directory of the virtual user. Incase of the system user, the logs indicate that the mailbox_command was fired and I do get to see the mail in the inbox. My postfix *main.cf <http://main.cf>*: alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no broken_sasl_auth_clients = yes config_directory = /etc/postfix dovecot_destination_recipient_limit = 1 inet_interfaces = all *mailbox_command = /usr/lib/dovecot/deliver -c /etc/dovecot/conf.d/01-mail-stack-delivery.conf -m "${EXTENSION}"* mailbox_size_limit = 0 mydestination = localhost, localhost.localdomain, localhost myhostname = mydomain.com mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 readme_directory = no recipient_delimiter = + relayhost = smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtp_use_tls = yes smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) smtpd_recipient_restrictions = reject_unknown_recipient_domain, reject_unauth_pipelining, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination smtpd_sasl_auth_enable = yes smtpd_sasl_authenticated_header = yes smtpd_sasl_local_domain = $myhostname smtpd_sasl_path = private/dovecot-auth smtpd_sasl_security_options = noanonymous smtpd_sasl_type = dovecot smtpd_sender_restrictions = reject_unknown_sender_domain smtpd_tls_auth_only = yes smtpd_tls_cert_file = /root/certs/www.mydomain.com.pem smtpd_tls_key_file = /root/certs/www.mydomain.com.key smtpd_tls_mandatory_ciphers = medium smtpd_tls_mandatory_protocols = SSLv3, TLSv1 smtpd_tls_received_header = yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_use_tls = yes tls_random_source = dev:/dev/urandom transport_maps = pgsql:/etc/postfix/transport.cf virtual_gid_maps = pgsql:/etc/postfix/gids.cf virtual_mailbox_base = /home virtual_mailbox_domains = mydomain.com *virtual_mailbox_maps = pgsql:/etc/postfix/mailboxes.cf <http://mailboxes.cf>* virtual_maps = pgsql:/etc/postfix/virtual.cf *virtual_transport = dovecot* virtual_uid_maps = pgsql:/etc/postfix/uids.cf I have included the virtual_transport parameter to indicate that dovecot is running as LDA. I have also included the pgsql query file in the virtual_mailbox_maps parameter. My *mailboxes.cf <http://mailboxes.cf> *file which points the email id of the virtual user to the appropriate mail path: user=mailreader password=secret dbname=mails table=postfix_mailboxes select_field=mailbox where_field=userid hosts=localhost My postfix *master.cf <http://master.cf>* file: smtp inet n - n - - smtpd pickup fifo n - - 60 1 pickup cleanup unix n - - - 0 cleanup qmgr fifo n - n 300 1 qmgr tlsmgr unix - - - 1000? 1 tlsmgr rewrite unix - - - - - trivial-rewrite bounce unix - - - - 0 bounce defer unix - - - - 0 bounce trace unix - - - - 0 bounce verify unix - - - - 1 verify flush unix n - - 1000? 0 flush proxymap unix - - n - - proxymap proxywrite unix - - n - 1 proxymap smtp unix - - - - - smtp relay unix - - - - - smtp showq unix n - - - - showq error unix - - - - - error retry unix - - - - - error discard unix - - - - - discard local unix - n n - - local virtual unix - n n - - virtual lmtp unix - - - - - lmtp anvil unix - - - - 1 anvil scache unix - - - - 1 scache maildrop unix - n n - - pipe flags=DRhu user=vmail argv=/usr/bin/maildrop -d ${recipient} uucp unix - n n - - pipe flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient) *dovecot unix - n n - - pipe* * flags=DRhu user=vmailuser:vmailuser argv=/usr/lib/dovecot/deliver -f* * ${sender} -d ${recipient}* ifmail unix - n n - - pipe flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient) bsmtp unix - n n - - pipe flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient scalemail-backend unix - n n - 2 pipe flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension} mailman unix - n n - - pipe flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py ${nexthop} ${user} I have included the dovecot LDA service line above so that postfix can deliver to virtual users as per: http://wiki2.dovecot.org/LDA/Postfix This is my *doveconf -n* output: # 2.0.19: /etc/dovecot/dovecot.conf # OS: Linux 3.2.0-24-virtual i686 Ubuntu 12.04 LTS ext4 auth_debug = yes auth_debug_passwords = yes auth_mechanisms = plain login digest-md5 cram-md5 auth_verbose = yes mail_debug = yes *mail_location = maildir:/home/vmailuser/%d/%n/Maildir* managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave passdb { args = /etc/dovecot/dovecot-sql.conf driver = sql } plugin { sieve = ~/.dovecot.sieve sieve_dir = ~/sieve } protocols = imap pop3 sieve service auth { unix_listener /var/spool/postfix/private/dovecot-auth { group = postfix mode = 0660 user = postfix } } ssl_cert = </root/certs/www.mydomain.com.pem ssl_cipher_list = ALL:!LOW:!SSLv2:ALL:!aNULL:!ADH:!eNULL:!EXP:RC4+RSA:+HIGH:+MEDIUM ssl_key = </root/certs/www.mydomain.com.key userdb { args = /etc/dovecot/dovecot-sql.conf driver = sql } verbose_ssl = yes protocol imap { imap_client_workarounds = delay-newmail mail_max_userip_connections = 10 } protocol pop3 { mail_max_userip_connections = 10 pop3_client_workarounds = outlook-no-nuls oe-ns-eoh } protocol lda { deliver_log_format = msgid=%m: %$ mail_plugins = sieve postmaster_address = postmaster quota_full_tempfail = yes rejection_reason = Your message to <%t> was automatically rejected:%n%r } I have setup *mail_location *to point to the home directory of vmailuser under which for the given domain the virtual users mail dir is created. However, the mails clearly don't seem to get delivered for the virtual user. Any help to fix this would be appreciated. Thanks! :) Regards Tru Pheenix

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[Dovecot] Missing i_stream_unref in imap_msgpart_crlf_seek()?
by Tomasz Potega 06 Nov '13

06 Nov '13

Hi, imap_msgpart_crlf_seek() returns an error stream in case of problems in message_skip_virtual(). The original input stream is not being unreferenced, preventing destroy callbacks from being executed. Shouldn't we have an i_stream_unref(&input) here: src/lib-imap-storage/imap-msgpart.c: 398 if (message_skip_virtual(input, virtual_skip, &cr_skipped) < 0) { 399 errinput = i_stream_create_error(errno); 400 i_stream_set_name(errinput, i_stream_get_name(input)); 401 return errinput; 402 } ? Best regards, Tomasz Potęga [Wirtualna Polska] <http://www.wp.pl> Znajdziesz nas tutaj: [Wp na Facebooku] <https://www.facebook.com/WirtualnaPolska> [Wp na Twitterze] <https://twitter.com/wirtualnapolska> [Wp na SlideShare] <http://www.slideshare.net/wirtualnapolska> [Wp w Google+] <https://plus.google.com/+wppl> [Wp na YouTube] <https://www.youtube.com/user/wptvwppl> "WIRTUALNA POLSKA" Spółka Akcyjna z siedzibą w Gdańsku przy ul. Traugutta 115 C, wpisana do Krajowego Rejestru Sądowego - Rejestru Przedsiębiorców prowadzonego przez Sąd Rejonowy Gdańsk - Północ w Gdańsku pod numerem KRS 0000068548, o kapitale zakładowym 67.980.024,00 złotych opłaconym w całości oraz Numerze Identyfikacji Podatkowej 957-07-51-216.

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[Dovecot] get_disconnect_reason() gets called with NULL ctx->litinput
by Tomasz Potega 06 Nov '13

06 Nov '13

Hi, I have found get_disconnect_reason() to be called with NULL ctx->litinput at times, making dovecot crash when accessing v_offset: src/imap/cmd-append.c: 83 switch (i_stream_read(client->input)) { 84 case -1: 85 /* disconnected */ 86 reason = get_disconnect_reason(ctx, ctx->litinput->v_offset); 87 cmd_append_finish(cmd->context); 88 /* Reset command so that client_destroy() doesn't try to call 89 cmd_append_continue_message() anymore. */ Best regards, Tomasz Potęga [Wirtualna Polska] <http://www.wp.pl> Znajdziesz nas tutaj: [Wp na Facebooku] <https://www.facebook.com/WirtualnaPolska> [Wp na Twitterze] <https://twitter.com/wirtualnapolska> [Wp na SlideShare] <http://www.slideshare.net/wirtualnapolska> [Wp w Google+] <https://plus.google.com/+wppl> [Wp na YouTube] <https://www.youtube.com/user/wptvwppl> "WIRTUALNA POLSKA" Spółka Akcyjna z siedzibą w Gdańsku przy ul. Traugutta 115 C, wpisana do Krajowego Rejestru Sądowego - Rejestru Przedsiębiorców prowadzonego przez Sąd Rejonowy Gdańsk - Północ w Gdańsku pod numerem KRS 0000068548, o kapitale zakładowym 67.980.024,00 złotych opłaconym w całości oraz Numerze Identyfikacji Podatkowej 957-07-51-216.

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[Dovecot] ssl-params regeneration with dovecot 2.2.7
by Frank Elsner 06 Nov '13

06 Nov '13

Hello, after switching from version 2.2.7 to 2.2.7 I miss the loglines which say: ssl-params: Generating SSL parameters ssl-params: SSL parameters regeneration completed The configuration has not been changed and reads: | # 2.2.7: /usr/local/dovecot/etc/dovecot/dovecot.conf | # OS: Linux 2.6.35.14-106.fc14.i686.PAE i686 Fedora release 14 (Laughlin) ext3 | auth_mechanisms = plain login | default_vsz_limit = 512 M | first_valid_uid = 200 | last_valid_uid = 65534 | listen = * | lmtp_save_to_detail_mailbox = yes | login_greeting = c64.shuttle.de - IMAPs Service (dovecot) ready. | login_log_format_elements = %u %r %c | mail_location = maildir:/var/spool/mail/%u | mail_log_prefix = "%Us(%u,%r): " | mail_plugin_dir = /usr/dovecot/lib/dovecot/ | mail_plugins = notify quota fts fts_squat | namespace inbox { | inbox = yes | list = yes | location = | mailbox Drafts { | special_use = \Drafts | } | mailbox Gesendet { | special_use = \Sent | } | mailbox SPAM { | special_use = \Junk | } | mailbox Sent { | special_use = \Sent | } | mailbox Trash { | special_use = \Trash | } | prefix = | subscriptions = yes | type = private | } | passdb { | args = dovecot | driver = pam | } | plugin { | fts = squat | fts_squat = partial=4 full=10 | mail_log_events = delete undelete expunge copy mailbox_delete mailbox_rename flag_change append | mail_log_fields = uid box from subject msgid size flags | mail_log_group_events = yes | quota = maildir:User quota | quota_rule = *:storage=2G | quota_rule2 = Trash:storage=+100M | } | postmaster_address = postmaster(a)moltke28.b.shuttle.de | protocols = imap | service anvil { | client_limit = 1027 | } | service auth { | unix_listener auth-client { | group = exim | mode = 0660 | user = exim | } | } | service imap-login { | inet_listener imap { | port = 143 | } | inet_listener imaps { | port = 993 | ssl = yes | } | process_limit = 512 | process_min_avail = 10 | } | service imap-postlogin { | executable = script-login /usr/local/sbin/dovecot-imap-post-login | } | service imap { | executable = imap imap-postlogin | } | service lmtp { | inet_listener lmtp { | address = 0.0.0.0 | port = 24 | } | } | service pop3-login { | inet_listener pop3 { | port = 110 | } | inet_listener pop3s { | port = 995 | ssl = yes | } | } | service pop3 { | process_limit = 1024 | } | ssl_cert = </usr/local/etc/c64.shuttle.de.CRT | ssl_key = </usr/local/etc/c64.shuttle.de-dovecot.KEY | ssl_parameters_regenerate = 1 hours | userdb { | driver = passwd | } | verbose_proctitle = yes | protocol lmtp { | mail_plugins = notify quota fts fts_squat | } | protocol lda { | mail_plugins = notify quota fts fts_squat | } | protocol imap { | imap_client_workarounds = delay-newmail tb-extra-mailbox-sep tb-lsub-flags | imap_logout_format = [%i/%o] | mail_max_userip_connections = 0 | mail_plugins = notify quota fts fts_squat quota mail_log imap_quota listescape fts fts_squat | } What's going on? No more logging or no regeneration? Greetings, Frank Elsner

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[Dovecot] 2.2.6 auth process crash using LMTP and LDAP on director.
by Olivier Girard 06 Nov '13

06 Nov '13

I'm upgrading my configuration to use director and lmtp for delivery. (doveconf -n at end of the mail). I use the same config for auth on mail backends and see no errors. My setup seem to work nicely but i have some auth process crashing when using lmtp protocol. Everything is working a sexpected then i've got 5-6 errors like this in logs and a crach of the auth process: dovecot: lmtp(47269): Error: passdb lookup(_mail_): Disconnected unexpectedly pid 47406 (auth), uid 143: exited on signal 11 Actually, i didn't configure to core dump. Do you think seting up lmtp protocol to static auth adding something like folow will be better for this problem? protocol lmtp { passdb { args = proxy=y nopassword=y driver = static } } Please note that my configuration is actually listening on inet fot LMTP but that the goal is to configure postfix on the same server and switch to socket, this expain the configuration of the service auth to provide a socket to postfix. Here is my director config: % doveconf -n # 2.2.6: /usr/local/etc/dovecot/dovecot.conf # OS: FreeBSD 8.4-RELEASE-p4 amd64 auth_cache_negative_ttl = 0 auth_cache_size = 16 M auth_mechanisms = plain login auth_verbose = yes auth_verbose_passwords = sha1 default_process_limit = 4000 director_mail_servers = 192.168.16.1 192.168.16.2 192.168.16.3 director_servers = 192.168.16.4 192.168.16.5 192.168.16.6 disable_plaintext_auth = no doveadm_port = 24245 info_log_path = syslog instance_name = director lmtp_proxy = yes mail_debug = yes 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 = /usr/local/etc/dovecot/dovecot-ldap.conf.ext driver = ldap } plugin { mail_log_events = delete undelete expunge copy mailbox_delete mailbox_rename mail_log_fields = uid box msgid size } service anvil { client_limit = 12003 } service auth-worker { process_min_avail = 10 user = $default_internal_user } service auth { client_limit = 16000 unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0666 user = postfix } unix_listener auth-userdb { mode = 0666 user = $default_internal_user } user = $default_internal_user } service director { fifo_listener login/proxy-notify { mode = 0666 } inet_listener { address = 192.168.16.4 port = 9090 } unix_listener director-userdb { mode = 0600 } unix_listener login/director { mode = 0666 } } service doveadm { inet_listener { port = 24245 } } service imap-login { executable = imap-login director } service lmtp { inet_listener lmtp { address = * :: port = 24 } } service pop3-login { executable = pop3-login director } ssl_cert = </etc/ssl/cert/mail.univ-angers.fr.pem ssl_key = </etc/ssl/cert/mail.univ-angers.fr.key userdb { args = /usr/local/etc/dovecot/dovecot-ldap.conf.ext driver = ldap } protocol lmtp { auth_socket_path = director-userdb } protocol doveadm { auth_socket_path = director-userdb } local 192.168.16.0/24/24 { doveadm_password = mysecret } Last thing, in my config file, there is only one /24 on local network but this is another problem.

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[Dovecot] Best way from Mbox to Maildir using 2.17?
by Regan Yelcich 06 Nov '13

06 Nov '13

Can someone advise the best way to convert mailboxes from Mbox to Maildir for Dovecot 2.17 on Ubuntu? Thanks.

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Re: [Dovecot] Issue with postfix not handing over e-mails to dovecot
by Joseph Tam 05 Nov '13

05 Nov '13

Tru Pheenix writes: > posftconf output: https://gist.github.com/anonymous/7318863 > doveconf output: https://gist.github.com/anonymous/7318896 > tail -f /var/log/mail.* output (when receiving mail): > https://gist.github.com/anonymous/7318945 Unless these are exceeding long, you probably should inline the contents to save people from having to jump around to get the information to help you. It will also properly archive the context to the solution. >From your logs, it appears your mail system does not know what user is mapped to "someone(a)mydomain.com": Nov 5 13:21:06 localhost postfix/local[11185]: 5716D8007B: to=<someone(a)mydomain.com>, relay=local, delay=0.59, delays=0.57/0.01/0/0.01, dsn=5.1.1, status=bounced (unknown user: "someone") I don't know whether this message is produced by postfix or by dovecot, but one thing I did notice is that your postfix configuration mailbox_command = /usr/lib/dovecot/deliver -c /etc/dovecot/conf.d/01-mail-stack-delivery.conf -m "${EXTENSION}" has upper-case "EXTENSION", whereas the Dovecot wiki uses lower case: http://wiki2.dovecot.org/LDA/Postfix If that's not it, maybe it's your SQL. You can also ask dovecot to look up user "somebody" and debug your way from there: doveadm user somebody Joseph Tam <jtam.home(a)gmail.com>

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[Dovecot] squat assertion result core dump with imap process
by Kui Zhang 05 Nov '13

05 Nov '13

Hello, Recently, we had a file system problem. After fsck we started to get some core dump with imap process. Nov 4 15:15:04 mail_server1 dovecot: imap(user(a)domain.tld): Panic: file squat-trie.c: line 293 (squat_trie_lock): assertion failed: (trie->fd != -1) Nov 4 15:15:04 mail_server1 dovecot: imap(user(a)domain.tld): Error: Raw backtrace: /usr/lib/dovecot/libdovecot.so.0(+0x4892a) [0x7fe8b7c9392a] -> /usr/lib/dovecot/libdovecot.so.0(+0x48976) [0x7fe8b7c93976] -> /usr/lib/dovecot/libdovecot.so.0(i_error+0) [0x7fe8b7c66faf] -> /usr/lib/dovecot/modules/lib21_fts_squat_plugin.so(+0x4ef4) [0x7fe8b51d9ef4] -> /usr/lib/dovecot/modules/lib21_fts_squat_plugin.so(squat_trie_build_deinit+0x9d2) [0x7fe8b51dcc02] -> /usr/lib/dovecot/modules/lib21_fts_squat_plugin.so(+0x4150) [0x7fe8b51d9150] -> /usr/lib/dovecot/modules/lib21_fts_squat_plugin.so(+0x41b1) [0x7fe8b51d91b1] -> /usr/lib/dovecot/modules/lib20_fts_plugin.so(+0x6b7c) [0x7fe8b5a05b7c] -> /usr/lib/dovecot/modules/lib20_fts_plugin.so(fts_backend_update_deinit+0x2c) [0x7fe8b5a05bfc] -> /usr/lib/dovecot/modules/lib10_quota_plugin.so(+0xb65a) [0x7fe8b642765a] -> /usr/lib/dovecot/libdovecot-storage.so.0(mdbox_sync_begin+0x419) [0x7fe8b7f22069] -> /usr/lib/dovecot/libdovecot-storage.so.0(mdbox_sync+0x46) [0x7fe8b7f224a6] -> /usr/lib/dovecot/libdovecot-storage.so.0(mdbox_storage_sync_init+0x87) [0x7fe8b7f22587] -> /usr/lib/dovecot/libdovecot-storage.so.0(mailbox_sync_init+0x31) [0x7fe8b7f614d1] -> dovecot/imap [user(a)domain.tld 204.174.223.223 UID](imap_sync_init+0x67) [0x419397] -> dovecot/imap [user(a)domain.tld204.174.223.223 UID](cmd_sync_delayed+0x1c7) [0x419637] -> dovecot/imap [user(a)domain.tld 204.174.223.223 UID](client_handle_input+0x1fd) [0x41131d] -> dovecot/imap [user(a)domain.tld 204.174.223.223 UID](client_input+0x5f) [0x411b7f] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x36) [0x7fe8b7c9fb56] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x9f) [0x7fe8b7ca0b8f] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_run+0x28) [0x7fe8b7c9faf8] -> /usr/lib/dovecot/libdovecot.so.0(master_service_run+0x13) [0x7fe8b7c8b413] -> dovecot/imap [user(a)domain.tld 204.174.223.223 UID](main+0x2a4) [0x419dd4] -> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd) [0x7fe8b78dfead] -> dovecot/imap [user(a)domain.tld 204.174.223.223 UID Nov 4 15:15:04 mail_server1 dovecot: imap(user(a)domain.tld): Fatal: master: service(imap): child 28415 killed with signal 6 (core dumped) doveadm index -u user(a)domain.tld mailbox_name Removing index files and re index help with the crashes. From time to time we still get these in the log: Nov 5 10:52:53 mail_server1 dovecot: imap(user(a)domain.tld): Error: Corrupted squat uidlist file /media/drbd/user_name/mdbox/mailboxes/Drafts/dbox-Mails/dovecot.index.search.uids: wrong indexid Nov 5 11:40:00 mail_server1 dovecot: imap(user(a)domain.tld): Error: Corrupted squat uidlist file /media/drbd/user_name/mdbox/mailboxes/folder2/dbox-Mails/dovecot.index.search.uids: wrong indexid I am using: dovecot-dbg 2:2.1.16-0~auto+30 Thanks Kui.Z

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