- dovecot - dovecot.org

What's a Reasonable Inbox Size?
by Asai 09 May '20

09 May '20

Greetings, I have several users who have inboxes that are over 20 GB. Lately I have noticed Dovecot logs say it's taking over 30 seconds to sync their mailboxes. As email admins, how do you handle inboxes that are so large? Do you use mailbox types that have better performance like dbox? We're using maildir. What's a reasonable inbox size? Is 20+ GB reasonable and nothing to worry about? Thanks for any insight here. -- Asai7

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Unable to disable TLSv1.3 or fallback to TLSv1.2 when 1 cipher is disabled
by Steve Egbert 09 May '20

09 May '20

I have an operational need to disable TLSv1.3 due to inadequate support to exclude certain ciphers. Much to my dismay, the `ssl_protocols` had been renamed and re-functionalized into `ssl_min_protocol`. Now, there is no way to exclude a specific group of one or more TLS versions. For a new bug report, I think we need two new settings: * `ssl_tls13_ciphersuite` and * `ssl_tls10_cipher` settings introduced into Dovecot for better granularity. ALong with support for fallback to TLSv1.2 as outlined in https://bugzilla.mozilla.org/show_bug.cgi?id=1250568 I'm still being hammered with the following error with Thunderbird 76.0b3, Dovecot 2.3.4.1-5+deb10u1, Debian 11: May 8 11:15:47 ns1 dovecot: imap-login: Debug: SSL: where=0x10, ret=1: before SSL initialization May 8 11:15:47 ns1 dovecot: imap-login: Debug: SSL: where=0x2001, ret=1: before SSL initialization May 8 11:15:47 ns1 dovecot: imap-login: Debug: SSL: where=0x2002, ret=-1: before SSL initialization May 8 11:15:47 ns1 dovecot: imap-login: Debug: SSL: where=0x2001, ret=1: before SSL initialization May 8 11:15:47 ns1 dovecot: imap-login: Debug: SSL alert: where=0x4008, ret=582: fatal protocol version May 8 11:15:47 ns1 dovecot: imap-login: Debug: SSL: where=0x2002, ret=-1: error May 8 11:15:47 ns1 dovecot: imap-login: Debug: SSL error: SSL_accept() failed: error:14209102:SSL routines:tls_early_post_process_client_hello:unsupported protocol May 8 11:15:47 ns1 dovecot: imap-login: Disconnected (disconnected before auth was ready, waited 0 secs): user=<>, rip=XX.XX.XX.XX, lip=XX.XX.XX.XX, TLS handshaking: SSL_accept() failed: error:14209102:SSL routines:tls_early_post_process_client_hello:unsupported protocol, session=<GN/GeCSlYuhEhl2U> May 8 11:15:47 ns1 dovecot: imap-login: Debug: SSL error: SSL_accept() syscall failed: Invalid argument This occurred when specifying one TLSv1.3 cipher to be excluded in ssl_cipher via an exclamation mark. On a side note of IMAP client, Latest Mozilla Thunderbird had its pref setting security.tls.version.fallback-limit to 4 (TLSv1.3), of which I have adjusted it to 3 (TLSv1.2) and it .... works when Dovecot is set to TLSv1.2. (Details of Thunderbird security.tls.version.fallback-limit is given in http://kb.mozillazine.org/Security.tls.version.* ) Steve

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dovecot-lda quota warning email add BCC
by Admin Beckspaced 08 May '20

08 May '20

Dear dovecot users, I have setup doveot with quota warning. Once a quota wearning is reached a shell script is called which then sends an email to the user via dovecot LDA this is the command in the shell script: /usr/lib/dovecot/dovecot-lda -d $USER -o "plugin/quota=dict:User quota::noenforcing:proxy::quota" I already have looked in the docs: https://wiki.dovecot.org/LDA but can't find an option to add a BCC I would like to receive a copy of the quota warning email so I also get notified and know if user mailboxes get filled up. How could I achieve that? thanks & greetings Becki

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courier-dovecot-migrate.pl and courier-5: UTF-8 flag
by Maxim Nikulin 08 May '20

08 May '20

Hi, Courier to dovecot migration script https://dovecot.org/tools/courier-dovecot-migrate.pl referenced at the https://wiki.dovecot.org/Migration/Courier page has a couple of problems. One of them is that the script could not process courierpop3dsizelist generated by courier-5. File format has been changed a bit to mark UTF-8 messages with an additional attribute. Is it safe to ignore such flag or its value should be stored somewhere for dovecot? Internally courier assumes false value during migration from the previous format version (v2 to v3). --- courier-dovecot-migrate.pl.orig 2012-07-28 17:14:20.000000000 +0000 +++ courier-dovecot-migrate.pl 2020-05-08 09:54:53.249214022 +0000 @@ -170,8 +170,9 @@ my $pop3_fname = "$dir/$courier_pop3_uidfile"; open( $f, $pop3_fname ) || die $!; my $pop3_hdr = <$f>; - if ( $pop3_hdr =~ /^\/2 (\d+) (\d+)$/ ) { + if ( $pop3_hdr =~ /^\/[23] (\d+) (\d+)$/ ) { # /2 <next uid> <uidvalidity> + # /3 <next uid> <uidvalidity> $_ = <$f>; } elsif ( $pop3_hdr =~ /^\/1 (\d+)$/ ) { @@ -193,9 +194,13 @@ chomp $_; $line++; - my ( $full_fname, $fsize, $uid, $uidv ); + my ( $full_fname, $fsize, $uid, $uidv, $_is_utf8 ); - if ( /^([^ ]+) (\d+) (\d+):(\d+)$/ ) { + if ( /^([^ ]+) (\d+) (\d+):(\d+):(\d+)$/ ) { + # v3 + ( $full_fname, $fsize, $uid, $uidv, $_is_utf8 ) = ( $1, $2, $3, $4, $5 ); + } + elsif ( /^([^ ]+) (\d+) (\d+):(\d+)$/ ) { # v2 ( $full_fname, $fsize, $uid, $uidv ) = ( $1, $2, $3, $4 ); }

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Seive + Spamprobe terminates with signal 6
by Mark Constable 08 May '20

08 May '20

Ubuntu 20.04, Dovecot 2.3.7.2, SpamProbe v1.4d. For the past weeks my sieve filters that call spamprobe have been crashing out for some users. I have a dozen similar server setups and this is not happening on any of the other servers and it was working just fine for a year up until recently. This particular server is quite busy. There is plenty of disk space and inode usage is about 2.5%. Permissions look the same as on the other servers. I'm hoping someone might have a suggestion as to the cause of this? Apr 22 10:31:24 mail dovecot: lmtp(xxxx(a)example.com)<33016><oCuzElyQn174gAAA4xLzLg>: Error: program exec:/etc/dovecot/sieve/spamprobe (38010): Terminated abnormally with signal 6 Apr 22 10:31:24 mail dovecot: lmtp(xxxx(a)example.com)<33016><oCuzElyQn174gAAA4xLzLg>: Error: sieve: global: line 6: execute action: failed to execute to program `spamprobe': refer to server log for more information. [2020-04-22 10:31:24] ~ cat /etc/dovecot/sieve/global.sieve require ["vnd.dovecot.execute", "fileinto", "envelope", "variables", "editheader"]; if header :contains "from" ["root@", "daemon@", "postmaster@"] { fileinto "Trash"; } elsif header :contains "to" ["root@", "daemon@", "postmaster@"] { fileinto "Trash"; } if envelope :localpart :matches "to" "*" { set "lhs" "${1}"; } if envelope :domain :matches "to" "*" { set "rhs" "${1}"; } execute :pipe :output "SCORE" "spamprobe" ["-c", "-d", "/home/u/${rhs}/home/${lhs}/.spamprobe", "receive"]; addheader :last "X-Spam" "${SCORE}"; if header :matches "X-Spam" "SPAM*" { fileinto "Junk"; } plugin { imapsieve_mailbox1_before = file:/etc/dovecot/sieve/retrain-as-spam.sieve imapsieve_mailbox1_causes = COPY imapsieve_mailbox1_name = Junk imapsieve_mailbox2_before = file:/etc/dovecot/sieve/retrain-as-good.sieve imapsieve_mailbox2_causes = COPY imapsieve_mailbox2_from = Junk imapsieve_mailbox2_name = * listescape_char = mail_log_cached_only = yes mail_log_events = delete undelete expunge copy mailbox_delete mailbox_rename mail_log_fields = uid box msgid size sieve_before = file:/etc/dovecot/sieve/global.sieve sieve_dir = ~/sieve sieve_execute_bin_dir = /etc/dovecot/sieve sieve_extensions = +notify +imapflags +vacation-seconds sieve_global_dir = /etc/dovecot/sieve/ sieve_global_extensions = +vnd.dovecot.debug +editheader +vnd.dovecot.pipe +vnd.dovecot.execute sieve_max_redirects = 30 sieve_max_script_size = 1M sieve_pipe_bin_dir = /etc/dovecot/sieve sieve_plugins = sieve_imapsieve sieve_extprograms sieve_quota_max_scripts = 0 sieve_quota_max_storage = 0 sieve_redirect_envelope_from = recipient sieve_vacation_default_period = 60s sieve_vacation_max_period = 0 sieve_vacation_min_period = 5s sieve_vacation_send_from_recipient = yes } -- Mark Constable 0419 530 037 https://spiderweb.com.au

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auto: mdbox is automatically recognized as sdbox
by 刘莹莹 08 May '20

08 May '20

Hi:   I did a simple test with Dovecot-2.3.9:            First step : A test account uses mdbox format to store emails with 'mail_location = mdbox:%h/%Ld/%Ln:ALT=%h/altstorage/%Ld/%Ln',           Second step: I adjust 'mail_location = auto:'  and dovecot restart           Third step: telnet 127.0.0.1 143  then log in and fetch emails.     When I fetch email data , the log shows that the storage format is automatically recognized as sdbox and index is Rebuild, as the result, all emails is lost： May 08 12:22:15 mail imap(q2(a)a.com)<30883><+nFkVxul5oF/AAAB>: Debug: Mailbox INBOX: Mailbox opened because: SELECT May 08 12:22:15 mail imap(q2(a)a.com)<30883><+nFkVxul5oF/AAAB>: Warning: sdbox /srv/vmail/a.com/q2/mailboxes/INBOX/dbox-Mails: Rebuilding index May 08 12:23:12 mail auth-worker(30882): Debug: conn unix:auth-worker (pid=29526,uid=12348): Disconnected: Connection closed (fd=-1) May 08 12:24:19 mail imap(q2(a)a.com)<30883><+nFkVxul5oF/AAAB>: Info: Logged out in=50 out=881 deleted=0 expunged=0 trashed=0 hdr_count=0 hdr_bytes=0 body_count=0 body_bytes=0          I am confused why mdbox and sdbox cannot be recognized automatically or there are same problem with my test ??   Thanks

1 0

SPECIAL-USE and Outlook folders
by Alessio Cecchi 08 May '20

08 May '20

Hi, in the recent version of Outlook seem impossible to remap the Sent (but also Drafts) folders in order to show as the localized name. I have enabled the "special_use" in 10-mailbox.conf but still is not working: namespace inbox { inbox = yes location = mailbox Drafts { auto = subscribe special_use = \Drafts } mailbox Sent { auto = subscribe special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Spam { auto = subscribe special_use = \Junk } mailbox Trash { auto = subscribe special_use = \Trash } prefix = separator = / } On Internet someone suggest to add the imap_capability "XLIST" but I haven't understand if it the solutions. Does anyone have any suggestions? Thanks -- Alessio Cecchi Postmaster @ http://www.qboxmail.it https://www.linkedin.com/in/alessice

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Unable to set ssl_min_protocol=TLSv1.3
by Thomas Schneider 07 May '20

07 May '20

Good $daytime, as per the recommendations of Mozilla’s SSL config generator[0], I wanted to set ssl_min_protocol=TLSv1.3 in my dovecot config. This produced the error: imap-login: Error: Failed to initialize SSL server context: Unknown ssl_min_protocol setting 'TLSv1.3' After some digging, I found the function that parses this setting in src/lib-ssl-iostream/iostream-openssl-common.c (openssl_min_protocol_to_options()), which maps strings such as SSL_TXT_TLSV1_2 == "TLSv1.2" (from openssl/ssl.h) to the appropriate version and option defines of OpenSSL. Said openssl/ssl.h does not contain a SSL_TXT_TLSV1_3, so it’s no surprise that dovecot does not know this setting. As a quick fix, I could probably extend struct {…} protocol_versions[] (in iostream-openssl-common.c again) with an appropriate "TLSv1.3" entry (and send a patch), though I would also suggest to OpenSSL to add a SSL_TXT_TLSV1_3 define. Unfortunately, I have not found a config setting in dovecot to set SSL_OP_NO_TLSv1_2, or in fact any way to enforce TLS >=1.3, except maybe via the cipher list string. I think that dovecot should support setting this, and I’d also gladly provide a patch. Thanks, Thomas [0]: https://ssl-config.mozilla.org/#server=dovecot&version=2.3.4.1&config=moder…

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Urgent - Help needed
by Kishore Potnuru 07 May '20

07 May '20

Hi All, I am having dovecot installed on my redhat 7. There was an email came to my "Maildir" directory as per the logs. There is an application reading the emails from the Maildir inbox. I have the log stating the email has been delivered to maildir folder below. But the application team says that they didn't receive the email. The emails is also not there in the Maildir folder. Is there any way/log we can see, from Maildir folder, whether the application picked the email? or where that email went (to any server) from the Maildir folder? any such verification is possible? ============= [root@testserver log]# grep EB6A2206818 temp.log May 5 07:35:20 testserver postfix/smtpd[29839]: EB6A2206818: client=test-server May 5 07:35:20 testserver postfix/cleanup[29842]: EB6A2206818: message-id=<AM0PR01MB42257878E93ED4C6> May 5 07:35:21 testserver postfix/qmgr[29801]: EB6A2206818: from=< tester1(a)testing.com>, size=13614, nrcpt=1 (queue active) May 5 07:35:21 testserver postfix/virtual[29843]: EB6A2206818: to=< selfemail(a)testing2.com>, relay=virtual, delay=0.05, delays=0.05/0/0/0, dsn=2.0.0, status=sent (delivered to maildir) May 5 07:35:21 testserver postfix/qmgr[29801]: EB6A2206818: removed ============== Please help me... Thanks & Regards, Kishore Potnuru

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Re: Urgent - Help needed
by Kishore Potnuru 05 May '20

05 May '20

Thank you for the reply. Actually there are 7 emails sent by the user. 2 emails are delivered successfully. 5 are missing. All are having the same log with virtual. At present I might not be able to change those settings.... Is there any way to verify they are delivered to them or not? do we have any logs to verify the same? On Tue, May 5, 2020 at 9:16 AM Zhang Huangbin <zhb(a)iredmail.org> wrote: > > > On May 5, 2020, at 4:06 PM, Kishore Potnuru <kishore.reachme(a)gmail.com> > wrote: > > > > May 5 07:35:21 testserver postfix/virtual[29843]: EB6A2206818: to=< > selfemail(a)testing2.com>, relay=virtual, delay=0.05, delays=0.05/0/0/0, > dsn=2.0.0, status=sent (delivered to maildir) > > According to the log, this user is using Postfix builtin transport > "virtual" as LDA, not Dovecot LDA. Fixing this should get your email > delivered correctly. > > ---- > Zhang Huangbin, founder of iRedMail project: https://www.iredmail.org/ > >

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