- dovecot - dovecot.org

lmtp Panic Buffer write out of range
by Gabriele Nencioni 23 Aug '18

23 Aug '18

Hi all, as described here: https://www.dovecot.org/pipermail/dovecot/2018-July/112173.html we are experiencing the same error on dovecot version 2.3.2.1 while it never occurs on an old version as 2.2.15 It followings the error logs: On an upgraded dovecot backend: Aug 21 12:03:51 backend20 dovecot: lmtp(test1(a)internalinboundcm.eu)<SONkAYfje1veGgAAu8+/vw>: Panic: Buffer write out of range (789 + 18446744073709551606) /var/log/dovecot_lmtp_20180821.12.log-Aug 21 12:03:51 monti-backend20 dovecot: lmtp(test1(a)internalinboundcm.eu)<SONkAYfje1veGgAAu8+/vw>: Error: Raw backtrace: /usr/lib/dovecot/libdovecot.so.0(+0xcb851) [0x7f78e6f0a851] -> /usr/lib/dovecot/libdovecot.so.0(+0xcb8e9) [0x7f78e6f0a8e9] -> /usr/lib/dovecot/libdovecot.so.0(i_fatal+0) [0x7f78e6e78851] -> /usr/lib/dovecot/libdovecot.so.0(buffer_write+0x131) [0x7f78e6f04871] -> /usr/lib/dovecot/libdovecot-sieve.so.0(rfc2822_header_append+0xcf) [0x7f78e531613f] -> /usr/lib/dovecot/libdovecot-sieve.so.0(+0x7d35b) [0x7f78e531335b] -> /usr/lib/dovecot/libdovecot-sieve.so.0(edit_mail_header_add+0x1b) [0x7f78e531525b] -> /usr/lib/dovecot/libdovecot-sieve.so.0(+0x73014) [0x7f78e5309014] -> /usr/lib/dovecot/libdovecot-sieve.so.0(sieve_interpreter_continue+0x81) [0x7f78e52d2a11] -> /usr/lib/dovecot/libdovecot-sieve.so.0(sieve_interpreter_run+0x2b) [0x7f78e52d2c7b] -> /usr/lib/dovecot/libdovecot-sieve.so.0(+0x51000) [0x7f78e52e7000] -> /usr/lib/dovecot/libdovecot-sieve.so.0(sieve_multiscript_run+0x3a) [0x7f78e52e7eba] -> /usr/lib/dovecot/modules/lib90_sieve_plugin.so(+0x38f0) [0x7f78e554e8f0] -> /usr/lib/dovecot/libdovecot-lda.so.0(mail_deliver+0xf0) [0x7f78e750da30] -> dovecot/lmtp [81.88.49.172 DATA](lmtp_local_data+0x4f1) [0x5582554451d1] -> dovecot/lmtp [81.88.49.172 DATA](cmd_data_continue+0x243) [0x558255443ee3] -> /usr/lib/dovecot/libdovecot.so.0(+0x4c402) [0x7f78e6e8b402] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x69) [0x7f78e6f228a9] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0x109) [0x7f78e6f24199] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x52) [0x7f78e6f229b2] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_run+0x38) [0x7f78e6f22bc8] -> /usr/lib/dovecot/libdovecot.so.0(master_service_run+0x13) [0x7f78e6e9cff3] -> dovecot/lmtp [81.88.49.172 DATA](main+0x240) [0x558255442f70] -> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1) [0x7f78e6ac02e1] -> dovecot/lmtp [81.88.49.172 DATA](_start+0x2a) [0x5582554430ba] while once the user test1(a)internalinboundcm.eu has been moved on an old dovecot backend, with the "doveadm director move" command the message has been properly delivered at next retry attempt: Aug 21 12:32:31 backend01 dovecot: lmtp(test1(a)internalinboundcm.eu)<Zv32Lzbqe1tSLQAAF5Yx/g>: copy from <lmtp DATA>: box=Spam, uid=1, msgid=<ceb54c05728586392119651424858d85(a)l2.losclientes3.com> Aug 21 12:32:31 backend01 dovecot: lmtp(test1(a)internalinboundcm.eu)<Zv32Lzbqe1tSLQAAF5Yx/g>: Zv32Lzbqe1tSLQAAF5Yx/g: sieve: msgid=<ceb54c05728586392119651424858d85(a)l2.losclientes3.com>: stored mail into mailbox 'Spam' As you can see the message was detected as spam Let me know if you need more info or details (such us the original message or the sieve filter that trigger the problem) Thanks in advance Regards -- Gabriele Nencioni System Administrator eml gabriele.nencioni(a)register.it

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Re: Possible to set quota in size and number of messages
by J Doe 21 Aug '18

21 Aug '18

Hi Reio and list, It appears placing it at the end of the quota rules and then manually recalculating the quotas via doveadm has solved the problem! Configuration: plugin { quota = dict:User quota::file:%h/dovecot-quota quota_rule = *:storage=10G quota_rule1 = INBOX/Inbox:storage=+30M quota_rule2 = INBOX/Trash:storage=+30M quota_rule3 = INBOX/Deleted Messages:storage=+30M quota_rule4 = *:messages=100000 } Recalculate quotas: $ sudo doveadm quota recalc -u <account> Restart Dovecot and Apple Mail. Thanks, - J

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Possible to set quota in size and number of messages
by J Doe 21 Aug '18

21 Aug '18

Hello, I am using Dovecot 2.2.33.2 and am attempting to set quotas on mailboxes. I currently have the following: plugin { quota = dict:User quota::file:%h/dovecot-quota quota_rule = *:storage=10G quota_rule1 = INBOX/Inbox:storage=+30M quota_rule2 = INBOX/Trash:storage=+30M quota_rule3 = INBOX/Deleted Messages:storage=+30M } If I check the quota via Apple Mail version 11.5 (3445.9.1) on Mac OS X 10.13.6 by selecting “Get Account Info” it displays the correct quota size in bytes but also states “0 messages” (in that it states I can store 0 messages). Is there a way to signify to an IMAP client that the quota should be _EITHER_ 10 GB or 100,000 messages, just so a user doesn’t see that they can store a total of 0 messages ? My initial thought was to alter the previous quota settings by adding: quota_rule4 = INBOX:messages=100000 … and restarting Dovecot and Apple Mail, but upon checking the quota’s on the user’s account, I still see that a user can store 10 GB or 0 messages. Thanks, - J

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lazy expunge folder delete bug
by Jan-Pieter Cornet 21 Aug '18

21 Aug '18

There's a bug in "folder delete" for lazy expunge, type "1 namespace", as descibed on https://wiki2.dovecot.org/Plugins/Lazyexpunge When trying to delete a mailbox that still has messages in it, but that has no EXPUNGED/<name> counterpart, the process hangs after the imap "DELETE" command, and the following appears in the log file after a 60s timeout: Jun 22 15:48:15 userimap6 dovecot: imap(xtra30): Error: Couldn't create mailbox list lock /var/mail/.8d1/index/4/03/xtra30/index/mailboxes.lock: file_create_locked(/var/mail/.8d1/index/4/03/xtra30/index/mailboxes.lock) failed: flock(/var/mail/.8d1/index/4/03/xtra30/index/mailboxes.lock, write-lock) failed: Timed out after 60 seconds (BUG: lock is held by our own process) Jun 22 15:48:15 userimap6 dovecot: imap(xtra30): Error: lazy_expunge: Couldn't open expunge mailbox: Failed to create mailbox EXPUNGED/Test: Internal error occurred. Refer to server log for more information. [2018-06-22 15:47:15] Jun 22 15:48:15 userimap6 dovecot: imap(xtra30): Error: Lazy-expunge transaction failed: Internal error occurred. Refer to server log for more information. [2018-06-22 15:47:15] very quick summage of settings: ----8<----- mail_plugins = $mail_plugins lazy_expunge mail_location = mdbox:/var/mail/.8d1/mail/4/03/xtra30:INDEX=/var/mail/.8d1/index/4/03/xtra30/index ### from userdb namespace { inbox = yes list = yes prefix = separator = / } namespace expunged { hidden = yes inbox = no list = no prefix = EXPUNGED/ separator = / location = mdbox:/var/mail/.8d1/mail/4/03/xtra30:INDEX=/var/mail/.8d1/index/4/03/xtra30/index:MAILBOXDIR=expunged:LISTINDEX=expunged.list.index:SUBSCRIPTIONS=expunged.subscriptions ### also from userdb } plugin { lazy_expunge = EXPUNGED/ } ----8<----- (full doveconf available on request) State of the account before delete: mailbox "Test" exists, 20 messages in it: x LIST * * * LIST (\HasNoChildren \UnMarked \Trash) "/" Trash * LIST (\HasNoChildren \Marked) "/" Test * LIST (\HasNoChildren \UnMarked \Junk) "/" Spam * LIST (\HasNoChildren \UnMarked) "/" Sent * LIST (\HasNoChildren \UnMarked) "/" Drafts * LIST (\HasNoChildren) "/" INBOX x OK List completed (0.009 + 0.000 + 0.008 secs). x LIST EXPUNGED/* * x OK List completed (0.001 + 0.000 secs). x DELETE Test x NO [SERVERBUG] Internal error occurred. Refer to server log for more information. [2018-06-22 15:47:15] (60.064 + 0.000 + 60.063 secs). ... resulting in the above log lines. However, if you first delete one message (causing EXPUNGED/Test to be created), and then remove the folder, it works fine: x SELECT Test * FLAGS (\Answered \Flagged \Deleted \Seen \Draft) * OK [PERMANENTFLAGS (\Answered \Flagged \Deleted \Seen \Draft \*)] Flags permitted. * 20 EXISTS * 2 RECENT * OK [UNSEEN 1] First unseen. * OK [UIDVALIDITY 1352910749] UIDs valid * OK [UIDNEXT 21] Predicted next UID * OK [HIGHESTMODSEQ 21] Highest x OK [READ-WRITE] Select completed (0.010 + 0.000 + 0.009 secs). x FETCH 1:* (FLAGS) * 1 FETCH (FLAGS ()) [...boring...] * 20 FETCH (FLAGS (\Recent)) x OK Fetch completed (0.002 + 0.000 + 0.001 secs). x STORE 1 +FLAGS (\Deleted) * 1 FETCH (FLAGS (\Deleted)) x OK Store completed (0.011 + 0.000 + 0.010 secs). x EXPUNGE * 1 EXPUNGE x OK Expunge completed (0.131 + 0.000 + 0.130 secs). X LIST * * * LIST (\HasNoChildren \UnMarked \Trash) "/" Trash * LIST (\HasNoChildren \UnMarked) "/" Test * LIST (\HasNoChildren \UnMarked \Junk) "/" Spam * LIST (\HasNoChildren \UnMarked) "/" Sent * LIST (\HasNoChildren \UnMarked) "/" Drafts * LIST (\HasNoChildren) "/" INBOX X OK List completed (0.005 + 0.000 + 0.004 secs). x LIST EXPUNGED/* * * LIST (\HasNoChildren \Marked) "/" EXPUNGED/Test x OK List completed (0.002 + 0.000 + 0.001 secs). x SELECT INBOX * OK [CLOSED] Previous mailbox closed. * FLAGS (\Answered \Flagged \Deleted \Seen \Draft) [...INBOX opening msgs...] x OK [READ-WRITE] Select completed (0.005 + 0.000 + 0.004 secs). x DELETE Test x OK Delete completed (0.129 + 0.000 + 0.128 secs). x LIST * * * LIST (\HasNoChildren \UnMarked \Trash) "/" Trash * LIST (\HasNoChildren \UnMarked \Junk) "/" Spam * LIST (\HasNoChildren \UnMarked) "/" Sent * LIST (\HasNoChildren \UnMarked) "/" Drafts * LIST (\HasNoChildren) "/" INBOX x OK List completed (0.005 + 0.000 + 0.004 secs). x LIST EXPUNGED/* * * LIST (\HasNoChildren \Marked) "/" EXPUNGED/Test x OK List completed (0.003 + 0.000 + 0.002 secs). Seems the delete opeation locks the mailbox list, and then the expunge create hits the same lock. Is this something we can fix by changing settings? Eg use another location for the expunge lock? -- Jan-Pieter Cornet <johnpc(a)xs4all.net> Systeembeheer XS4ALL Internet bv www.xs4all.nl

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iOS Mail Client Not Copying to Sent Folder
by Asai 21 Aug '18

21 Aug '18

Greetings, We have many iOS clients, and some report that they’re having problems with iOS mail copying messages to their Sent folder. This happens 2 - 3 times per day, and the phone just says Sending and the client never knows if it sends. Client says apparently email DOES go out, but there is no recording of it. This is usually on our LAN. We’re not sure if this is solved via Postfix or Dovecot, or maybe something else, so I’m posting this message on both forums as a start. Can anyone point us in the right direction here? Running Postfix 2.11.1 and Dovecot ee 2.2.18.2 see doveconf -n below: # 2.2.18.2 (866bffbafde7): /etc/dovecot/dovecot.conf # Pigeonhole version 0.4.8 (73d4f6cd676a) # OS: Linux 2.6.32-358.el6.x86_64 x86_64 CentOS release 6.4 (Final) ext4 auth_mechanisms = plain login auth_verbose = yes auth_verbose_passwords = plain deliver_log_format = msgid=%m: from=%f: %$ lock_method = dotlock mail_home = /vmail/%d/%n/home mail_location = maildir:/vmail/%d/%n mail_plugins = " notify" 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 index ihave duplicate namespace { inbox = yes location = prefix = separator = / type = private } passdb { args = /etc/dovecot/dovecot-mysql.conf driver = sql } plugin { mail_log_events = delete expunge copy mailbox_delete flag_change append mailbox_rename mail_log_fields = box msgid from flags sieve = /vmail/%d/%n/home/.dovecot.sieve sieve_before = /etc/dovecot/sieve/junk-spam.sieve sieve_default = /etc/dovecot/sieve/junk-spam.sieve sieve_dir = /vmail/%d/%n/home/sieve } protocols = imap lmtp sieve service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0666 user = postfix } unix_listener auth-master { group = vmail mode = 0660 user = vmail } unix_listener auth-userdb { mode = 0660 user = vmail } user = root } service imap-login { process_limit = 200 process_min_avail = 16 service_count = 0 vsz_limit = 0 } service managesieve-login { inet_listener sieve { port = 4190 } process_min_avail = 0 service_count = 1 vsz_limit = 64 M } ssl_cert = </etc/postfix/ssl/triata.pem ssl_key = </etc/postfix/ssl/triata.key userdb { args = /etc/dovecot/dovecot-mysql.conf driver = sql } protocol lda { hostname = domain.net mail_plugin_dir = /usr/lib64/dovecot/ mail_plugins = sieve postmaster_address = postmaster(a)domain.net } protocol imap { imap_idle_notify_interval = 24 mins mail_max_userip_connections = 60 } protocol sieve { mail_max_userip_connections = 10 managesieve_implementation_string = Dovecot Pigeonhole managesieve_logout_format = bytes=%i/%o managesieve_max_line_length = 65536 }

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Strange problem on lmtp with dovecot 2.3.2.1
by davide marchi 20 Aug '18

20 Aug '18

Hi to all i have compiled and installed dovecot 2.3.2.1 on debian 6 with success but now i'm facing a strange problem on communication from postfix installed on server A with dovecot installed on server B (which version is 2.3.2.1). All incoming emails delivered from esternal from server A to server B with LMTP is rejected with this message error "smtpgw postfix/lmtp[1772]: 6194CA00B3: to=<xxxxxxxxxxxx(a)mail.cgilfe.it>, relay=192.168.10.50[192.168.10.50]:24, delay=0.02, delays=0/0.01/0.01/0, dsn=5.5.4, status=undeliverable (host 192.168.10.50[192.168.10.50] said: 501 5.5.4 Invalid FROM: Missing domain (in reply to MAIL FROM command))" I cant identify what is the problem , for now i have bypassed lmtp using smtp but my goal is returning to lmtp that i have used since old versions of dovecot.

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systemd also listening on imaps port
by Kai Schaetzl 20 Aug '18

20 Aug '18

I noticed that most of the time with dovecot 2.3 I get this output, showing systemd listening on the port as well: lsof -i TCP:993 systemd 1 root 38u IPv4 3388360574 0t0 TCP *:imaps (LISTEN) systemd 1 root 41u IPv6 3388360575 0t0 TCP *:imaps (LISTEN) dovecot 11607 root 5u IPv4 3388360574 0t0 TCP *:imaps (LISTEN) dovecot 11607 root 6r IPv6 3388360575 0t0 TCP *:imaps (LISTEN) Sometimes I don't get the extra systemd lines, but I can't reproduce it now. It's only for port 143 and 993. Other ports show only two dovecot processes. Operation seems to be normal. Is this how it is supposed to be with dovecot 2.3? This is Ubuntu 16.04.

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Re: creation of ssl-parameters fails
by Kai Schaetzl 20 Aug '18

20 Aug '18

Aki Tuomi wrote on Sun, 19 Aug 2018 18:21:31 +0300: > Just generate new parameters on some machine with good entropy source. So, if it fails to transform (although bigger) the machine hasn't enough entropy (because it's quite new?)? I'm generating now on the original machine from last year which is still going on while a second run on one of the machines where it failed to transform is already finished. So, that would indicate it has less entropy? Can I re-use the ssl-parameters.dat for several machines or should I create a new one for each? For the time being I just copied the dh.pem over, to get going, but I guess this should only be a temporary workaround? Thanks! Kai

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imapsieve: Change message flags on COPY
by Leandro Lucarella 20 Aug '18

20 Aug '18

Hello, I'm trying to do a simple thing using imapsieve, I want messages to be marked as read when moved to certain folders (Trash, Archive, Spam). All the set up to run the imapsieve script works perfectly, but I'm having trouble to make changes effective. As the RFC says, IMAP messages are immutable, but it's not clear to me reading the specs if this applies to IMAP flags too, as one can really change flags in IMAP without having to create a new (modified) message, I guess this is an exception? 3.8. The "setflag", "deleteflag", and "removeflag" Actions Implementations of IMAP events in Sieve MUST also support the imap4flags extension [RFC5232], and the actions associated with it are all applicable to any case that falls under IMAP events in Sieve. It is worth noting also that the "hasflag" test that is defined in the imap4flags extension might be particularly useful in scripts triggered by flag changes ("hasflag" will see the new, changed flags). The flag changes behave as though a client had made the change. As explained above, in order to avoid script loops, flag changes that are made as a result of a script that was itself invoked because of flag changes SHOULD NOT result in another script invocation. In any case, implementations MUST take steps to avoid such loops. https://tools.ietf.org/html/rfc6785 Should changing flags just work for imapsieve? I even tried to use fileinto to explicitly save a new message (as far as I understand if I use fileinto the implicit keep should be cancelled, so the original message should be flagged as \Deleted (this is another hint that changing flags in immutable messages should be fine), and a new message should be created with the changed flags. But this is not happening, after moving the message I see unseen message still not flagged with \Seen. This is my imapsieve script: ---------------------------- require ["variables", "imap4flags", "fileinto", "vnd.dovecot.imapsieve", "vnd.dovecot.environment", "vnd.dovecot.execute", "vnd.dovecot.debug"]; if header :matches "Subject" "*" { set "subject" "${1}"; } if header :matches "From" "*" { set "from" "${1}"; } if environment :matches "imap.mailbox" "*" { set "dst" "${1}"; } debug_log "IMAPSIEVE TEST ---------------------"; debug_log "subject:${subject}"; debug_log "from:${from}"; debug_log "dst:${dst}"; debug_log "END IMAPSIEVE TEST -----------------"; if string :is "${dst}" ["Archive", "Trash", "Spam", "Sent"] { debug_log "Moved to ${dst}, marking as read: '${subject}' <${from>"; setflag "\\Seen"; fileinto "${dst}"; } ---------------------------- This is the log: Aug 16 10:31:51 alerce dovecot: imap(luca): Debug: Archive: Mailbox opened because: UID MOVE Aug 16 10:31:51 alerce dovecot: imap(luca): Debug: Mailbox INBOX: Opened mail UID=13304 because: copying Aug 16 10:31:51 alerce dovecot: imap(luca): Debug: imapsieve: mailbox Archive: MOVE event Aug 16 10:31:51 alerce dovecot: imap(luca): Debug: imapsieve: Matched static mailbox rule [1] Aug 16 10:31:51 alerce dovecot: imap(luca): Debug: sieve: file storage: Using Sieve script path: /home/luca/sieve/imapsieve.sieve Aug 16 10:31:51 alerce dovecot: imap(luca): Debug: sieve: file script: Opened script `imapsieve' from `/home/luca/sieve/imapsieve.sieve' Aug 16 10:31:51 alerce dovecot: imap(luca): Debug: sieve: Opening script 1 of 1 from `/home/luca/sieve/imapsieve.sieve' Aug 16 10:31:51 alerce dovecot: imap(luca): Debug: sieve: Loading script /home/luca/sieve/imapsieve.sieve Aug 16 10:31:51 alerce dovecot: imap(luca): Debug: sieve: Script binary /home/luca/sieve/imapsieve.svbin successfully loaded Aug 16 10:31:51 alerce dovecot: imap(luca): Debug: sieve: binary save: not saving binary /home/luca/sieve/imapsieve.svbin, because it is already stored Aug 16 10:31:51 alerce dovecot: imap(luca): Debug: sieve: Executing script from `/home/luca/sieve/imapsieve.svbin' Aug 16 10:31:51 alerce dovecot: imap(luca): sieve: imapsieve: line 11: DEBUG: IMAPSIEVE TEST --------------------- Aug 16 10:31:51 alerce dovecot: imap(luca): sieve: imapsieve: line 12: DEBUG: subject:Ihr DHL Paket wurde zugestellt. Aug 16 10:31:51 alerce dovecot: imap(luca): sieve: imapsieve: line 13: DEBUG: from:DHL Paket <noreply(a)dhl.de> Aug 16 10:31:51 alerce dovecot: imap(luca): sieve: imapsieve: line 16: DEBUG: dst:Archive Aug 16 10:31:51 alerce dovecot: imap(luca): sieve: imapsieve: line 17: DEBUG: END IMAPSIEVE TEST ----------------- Aug 16 10:31:51 alerce dovecot: imap(luca): sieve: imapsieve: line 23: DEBUG: Moved to Archive, marking as read: 'Ihr DHL Paket wurde zugestellt.' <DHL Paket <noreply(a)dhl.de>> Aug 16 10:31:51 alerce dovecot: imap(luca): Debug: Archive: Mailbox opened because: lib-lda delivery Aug 16 10:31:51 alerce dovecot: imap(luca): sieve: left message in mailbox 'Archive' The last line looks weird, it seems like the message is not being copied, right? I tried adding a stop; too, as suggested in this thread https://www.dovecot.org/list/dovecot/2017-April/107658.html, but the effect is the same, the message in Archive is still not flagged as \Seen. So the main question here is if changing IMAP flags in imapsieve scripts shouldn't just work, without even having to use fileinto, and if not, why isn't even using fileinto working? PS: Please Cc me, I'm not in the list. Thanks! -- Leandro Lucarella (Luca) https://llucax.com

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creation of ssl-parameters fails
by Kai Schaetzl 19 Aug '18

19 Aug '18

I did that the last time one year ago, now on another machine with the same software (Ubuntu 16.04) it fails. openssl dhparam 4096 > /var/lib/dovecot/ssl-parameters.dat dd if=/var/lib/dovecot/ssl-parameters.dat bs=1 skip=88 | openssl dhparam -inform der > /etc/dovecot/dh.pem last command fails with 681+0 records in 681+0 records out 681 bytes copied, 0,00278343 s, 245 kB/s unable to load DH parameters 139858178938624:error:0D0680A8:asn1 encoding routines:asn1_check_tlen:wrong tag:../crypto/asn1/tasn_dec.c:1129: 139858178938624:error:0D07803A:asn1 encoding routines:asn1_item_embed_d2i:nested asn1 error:../crypto/asn1/tasn_dec.c:289:Type=DH ssl-parameters.dat is more than double the size as the one that worked. And that one I can still transform: 272+0 records in 272+0 records out 272 bytes copied, 0,00105017 s, 259 kB/s So, something with openssl dhparam 4096 > /var/lib/dovecot/ssl-parameters.dat must be wrong. But what? https://wiki.dovecot.org/SSL/DovecotConfiguration tells to use this command. Thanks! Kai

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