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Dovecot not offering TLSv1.2 after a few minutes
by Markus Wienhöfer 14 Nov '22

14 Nov '22

I have a very strange problem with one of our Dovecot servers (2.2.33.2) on Ubuntu 18.04. The current configuration allows for TLSv1 to TLSv1.3 connections. I can verify those using testssl.sh, the tests will succeed (although correctly mentioning, that TLSv1 and TLSv1.1 should be disabled). Running the tests again after about 5 minutes, the results are different. TLSv1.2 now shows "not offered and downgraded to a weaker protocol". Has anybody experienced a similar problem before? Best regards Markus

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Dovecot 2.3.19.1: BUG: Mailbox renaming algorithm got into a potentially infinite loop, aborting
by Ralf Becker 14 Nov '22

14 Nov '22

I found this from 2019 on the list: https://www.mail-archive.com/dovecot@dovecot.org/msg78898.html Timo mentioned it's tracked internally as DOP-1501, but I could find nothing about it being fixed on the (public) list. Any news about that and is the workaround of deleting dovecot.mailbox.log* and dovecot.list.index* still the recommendation, when running into this bug. Ralf -- Ralf Becker EGroupware GmbH [www.egroupware.org] Handelsregister HRB Kaiserslautern 3587 Geschäftsführer Birgit und Ralf Becker Leibnizstr. 17, 67663 Kaiserslautern, Germany Telefon +49 631 31657-0

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Submission: track authenticated_user
by itanguy＠univ-brest.fr 10 Nov '22

10 Nov '22

Hello, We would like to use Dovecot Submission to have less queues to maintain. The relayhost (Postfix) after Dovecot routes mail by sender_map, so authenticated user, not the "mail from" because . For what we've seen, we can't use receive header to retrieve this authenticated_user. Example of header : Received: from mailhost ([0.0.0.0]) by submission.host with ESMTPSA id submission-id (envelope-from<myadress(a)example.com>) for<myadress(a)example.com>; Thu, 9 Nov 2022 08:27:41 +0000 So we've thought to use X-client, but reading the doc seems that's not the a good way : /https://doc.dovecot.org/settings/core// - submission_relay_trusted If enabled, the relay server is trusted. Determines whether we try to send (Postfix-specific) XCLIENT data to the relay server (only if enabled). But, XCLIENT for Submission seems to not transfer LOGIN : /https://doc.dovecot.org/settings/core/ / XCLIENT command can be used to override: Session ID Client IP and port (|%{rip}|,|%{rport}|) HELO - Overrides what the client sent earlier in the EHLO command LOGIN - Currently unused PROTO - Currently unused |forward_*| fields can be sent to auth process’s passdb lookup The trust is always checked against the connecting IP address. Except if HAProxy is used, then the original client IP address is used. Do you know another way to inform the relayhost of submission of the authenticated_user? Thanks Ismaël TANGUY

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SSL error
by Ruben Safir 10 Nov '22

10 Nov '22

Hello I am getting this error and I have no idea why. openssh is upto date client bash-5.1$ fetchmail --ssl -p POP3 -uruben mail2.boroparkmd.com Enter password for ruben(a)mail2.boroparkmd.com: fetchmail: Server certificate verification error: self signed certificate fetchmail: Missing trust anchor certificate: /C=US/ST=NY/L=Brooklyn/O=Dovecot/OU=mail servuces/CN=*.boroparkmd.com/emailAddress=ruben@mrbrklyn.com fetchmail: This could mean that the root CA's signing certificate is not in the trusted CA certificate location, or that c_rehash needs to be run on the certificate directory. For details, please see the documentation of --sslcertpath and --sslcertfile in the manual page. See README.SSL for details. fetchmail: OpenSSL reported: error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed fetchmail: mail2.boroparkmd.com: SSL connection failed. fetchmail: socket error while fetching from ruben(a)mail2.boroparkmd.com fetchmail: Query status=2 (SOCKET) Server: Nov 9 09:36:13 mail2 dovecot[25838]: pop3-login: Disconnected: Connection closed: SSL_accept() failed: error:0A000412:SSL routines::sslv3 alert bad certificate: SSL alert number 42 (no auth attempts in 1 secs): user=<>, rip=96.57.23.83, lip=96.57.23.84, TLS handshaking: SSL_accept() failed: error:0A000412:SSL routines::sslv3 alert bad certificate: SSL alert number 42, session=<MBsPlArtPtxgORdT> -- So many immigrant groups have swept through our town that Brooklyn, like Atlantis, reaches mythological proportions in the mind of the world - RI Safir 1998 http://www.mrbrklyn.com DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002 http://www.nylxs.com - Leadership Development in Free Software http://www2.mrbrklyn.com/resources - Unpublished Archive http://www.coinhangout.com - coins! http://www.brooklyn-living.com Being so tracked is for FARM ANIMALS and extermination camps, but incompatible with living as a free human being. -RI Safir 2013

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Help with configuration?
by Ellie McNeill 10 Nov '22

10 Nov '22

Hi, I'm running my own mail server on Debian 11 with exim and Dovecot 2.3.13. I have it working, but I'm seeking advice on further customising my setup. I'm using the Maildir++ format with some personal folders. I use IMAP to retrieve mail and Dovecot's submission server to send mail. 1. I want to have incoming emails automatically placed in certain folders instead of 'Inbox' based on certain criteria. For example, I want all emails from PayPal to go into the 'PayPal' folder and all emails from the Debian mailing list to go into the 'Debian' folder. Can dovecot do this for me and what is the best approach? 2. When I delete an email using my user client, it is only 'marked' as deleted (Thunderbird places a scored line through it, and a 'T' is added to the filename in the Maildir). How can I get dovecot to automatically move mail marked 'deleted' to the Trash folder each time? I also want further delete operations on any mail in the 'Trash' folder to be permanently deleted. 3. I want to hide my client IP address from the headers when submitting mail to Dovecot's submissiond, but I can't seem to find any way to disable this. I would prefer that recipients only see the server IP address, but not the IP address of the mail client which submitted it. Regards, Ellie PS - When signing up for the mailing list, there was no selection ability on the question "Would you like to get replies to your mails only to the list, ie. add a Reply-To header?"

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Re: SSL error
by Joseph Tam 10 Nov '22

10 Nov '22

Ruben Safir <ruben(a)mrbrklyn.com> wrote: > > This got nothing to with LE or own CA. Bottom line is, you need to > > add your own CA to the cert tore (ideally) > > what is a cert tore? Someone has probably already replied to this, but it's a typo: the OP wanted to say "store". The certificate you created was used to sign itself ("self signed") and thus, asserts its own validity. If you need *other* people to trust your SSL service, you should sign your certificate using a third party authority (e.g. LetsEncrypt) to sign it. Most internet users will have these third party signing authority's certificates in their certificate store to validate your service certificate. If this is for your own personal use (i.e. you don't care about trust since you know it's your own certificate), you have to add your self-signed certificate into *your* system's certificate authority store so that your mail reader does not complain about an untrusted certificate. Clear? Joseph Tam <jtam.home(a)gmail.com>

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doveadm backup|sync works for every folder but INBOX
by Ralf Becker 09 Nov '22

09 Nov '22

I'm trying to migrate an old Cyrus 2.5 server to Dovecot 2.3.19 using doveadm backup -R, which works for all folders but the INBOX itself, which always stays empty. The Cyrus side uses altnamespace:no and unixhierarchysep:no, it's used as imapc: remote in doveadm backup -R with imapc_list_prefix=INBOX Dovecot uses the following namespace to migrate into: namespace inboxes { inbox = yes location = mailbox Sent { auto = subscribe special_use = \Sent } ### some more folders omitted ### prefix = INBOX/ separator = / subscriptions = no } I use the following command line for the migration: doveadm -o imapc_features='rfc822.size fetch-headers' -o mail_prefetch_count=20 -o namespace/subs/location=mbox:/var/dovecot/subs -o imapc_user='someuser' -o imapc_password='secret' -o imapc_host=<cyrus-ip> -o imapc_list_prefix=INBOX -D backup -f -n INBOX/ -R -u someuser@somedomain imapc: The debug output contains the following lines: Nov 02 10:16:01 dsync(someuser@somedomain): Debug: brain S: Namespace INBOX/ has location imapc: Nov 02 10:16:01 dsync(someuser@somedomain): Debug: brain M: Local mailbox tree: INBOX guid=d8d5a3122bce5f63ef9101001ebfc848 uid_validity=1667223083 uid_next=1 subs=no last_change=0 last_subs=0 Nov 02 10:16:01 dsync(someuser@somedomain): Debug: brain S: Local mailbox tree: INBOX guid=c92f64f79f0d1ed01e6d5b314f04886c uid_validity=1577952633 uid_next=32691 subs=no last_change=0 last_subs=0 Nov 02 10:16:28 dsync(someuser@somedomain): Warning: Mailbox changes caused a desync. You may want to run dsync again: Remote lost mailbox GUID c92f64f79f0d1ed01e6d5b314f04886c (maybe it was just deleted?) The Cyrus server is solely used for the migration, no access from anywhere else! doveadm mailbox status -u someuser@somedomain all INBOX reports: INBOX messages=0 recent=0 uidnext=1 uidvalidity=1667223083 unseen=0 highestmodseq=1 vsize=0 guid=d8d5a3122bce5f63ef9101001ebfc848 firstsaved=never As all other folders seem ok, I blamed the failure with the INBOX on the imapc_list_prefix and altnamespace:no and tried, adding the INBOX content with an other doveadm sync run: doveadm -o imapc_features='rfc822.size fetch-headers' -o mail_prefetch_count=20 -o namespace/subs/location=mbox:/var/dovecot/subs -o imapc_user='someuser' -o imapc_password='secret' -o imapc_host=<cyrus-ip> -D sync -1 -f -m INBOX -n INBOX/ -R -u someuser@somedomain imapc: That gives the following output: Nov 02 10:55:45 dsync(someuser@somedomain): Debug: brain S: Namespace INBOX/ has location imapc: Nov 02 10:55:45 dsync(someuser@somedomain): Debug: brain M: Local mailbox tree: INBOX guid=d8d5a3122bce5f63ef9101001ebfc848 uid_validity=1667223083 uid_next=1 subs=no last_change=0 last_subs=0 Nov 02 10:55:45 dsync(someuser@somedomain): Debug: brain S: Local mailbox tree: INBOX guid=c92f64f79f0d1ed01e6d5b314f04886c uid_validity=1577952633 uid_next=32691 subs=no last_change=0 last_subs=0 Nov 02 10:55:45 dsync(someuser@somedomain): Debug: brain M: Remote mailbox tree: INBOX guid=c92f64f79f0d1ed01e6d5b314f04886c uid_validity=1577952633 uid_next=32691 subs=no last_change=0 last_subs=0 Nov 02 10:55:45 dsync(someuser@somedomain): Debug: brain S: Remote mailbox tree: INBOX guid=d8d5a3122bce5f63ef9101001ebfc848 uid_validity=1667223083 uid_next=1 subs=no last_change=0 last_subs=0 Nov 02 10:55:45 dsync(someuser@somedomain): Debug: brain M: Mailbox INBOX: local=d8d5a3122bce5f63ef9101001ebfc848/0/1, remote=c92f64f79f0d1ed01e6d5b314f04886c/0/1: GUIDs conflict - will be merged later Nov 02 10:55:45 dsync(someuser@somedomain): Debug: Mailbox INBOX: Mailbox opened Nov 02 10:55:45 dsync(someuser@somedomain): Debug: brain M: Changing mailbox INBOX GUID d8d5a3122bce5f63ef9101001ebfc848 -> c92f64f79f0d1ed01e6d5b314f04886c Nov 02 10:55:45 dsync(someuser@somedomain): Debug: dict(file): Waiting for dict to finish pending operations Nov 02 10:55:45 dsync(someuser@somedomain): Debug: brain S: Remote mailbox tree deletion: guid=c8882c0029ce5f63a9aa0000ca9feb0b type=mailbox timestamp=1667223081 name= local update=not found Nov 02 10:55:45 dsync(someuser@somedomain): Debug: brain S: Mailbox INBOX: local=c92f64f79f0d1ed01e6d5b314f04886c/0/1, remote=d8d5a3122bce5f63ef9101001ebfc848/0/1: GUIDs conflict - will be merged later Nov 02 10:55:45 dsync(someuser@somedomain): Debug: Mailbox INBOX: Mailbox opened Nov 02 10:55:45 dsync(someuser@somedomain): Debug: brain S: Ignore nonexistent mailbox GUID c92f64f79f0d1ed01e6d5b314f04886c with -1 sync Nov 02 10:55:45 dsync(someuser@somedomain): Debug: brain S: We don't have mailbox c92f64f79f0d1ed01e6d5b314f04886c Nov 02 10:55:45 dsync(someuser@somedomain): Debug: brain M: Ignoring missing remote box GUID c92f64f79f0d1ed01e6d5b314f04886c Nov 02 10:55:45 dsync(someuser@somedomain): Debug: dict(file): Waiting for dict to finish pending operations Nov 02 10:55:45 dsync(someuser@somedomain): Debug: dict(file): dict destroyed Nov 02 10:55:45 dsync(someuser@somedomain): Debug: dict(file): Waiting for dict to finish pending operations Nov 02 10:55:45 dsync(someuser@somedomain): Debug: dict(file): dict destroyed Nov 02 10:55:45 dsync(someuser@somedomain): Debug: imapc(10.44.88.3:143): Disconnected Nov 02 10:55:45 dsync(someuser@somedomain): Debug: User session is finished Nov 02 10:55:45 dsync(someuser@somedomain): Debug: dict(file): dict destroyed Nov 02 10:55:45 dsync(someuser@somedomain): Debug: dict(file): Waiting for dict to finish pending operations Nov 02 10:55:45 dsync(someuser@somedomain): Debug: dict(file): dict destroyed Nov 02 10:55:45 doveadm(40708): Debug: auth-master: conn unix:/run/dovecot/auth-userdb (pid=1,uid=0): Disconnected: Connection closed (fd=9) doveadm mailbox status -u someuser@somedomain all INBOX INBOX messages=0 recent=0 uidnext=1 uidvalidity=1667223083 unseen=0 highestmodseq=1 vsize=0 guid=c92f64f79f0d1ed01e6d5b314f04886c firstsaved=never The interesting part is that INBOX somehow seems to have two different GUIDs, depending on how I sync it (compare the two doveadm mailbox status outputs). In a tcpdump of the IMAP trafic I can see a STATUS "INBOX" (UIDNEXT UIDVALIDITY) but no EXAMINE "INBOX" or something else I would expect from the sync. I can provide the full output of doveadm backup/sync and a pcap of the IMAP trafic, but not to the public list. Any idea what's wrong with the sync of the INBOX or other suggestions / imapc parameters to use? Ralf -- Ralf Becker EGroupware GmbH [www.egroupware.org] Handelsregister HRB Kaiserslautern 3587 Geschäftsführer Birgit und Ralf Becker Leibnizstr. 17, 67663 Kaiserslautern, Germany Telefon +49 631 31657-0

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"Mailbox isn't a valid MBOX file" Error
by Elise 06 Nov '22

06 Nov '22

Running currently two local mailclients: Outlook 2021 and Thunderbird 102.4.2 When using TB and remove a message on my main account, I get this error: [CANNOT] Mailbox isn't a valid mailbox On any other TB configured email accounts I can remove messages without any problems. First I thought that Outlook might block removal on messages, but the issue appears as well if I close that mail client. Can you tell what is causing this problem? Best regards, Jos Chrispijn

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Any update on lazy load SNI?
by Pierre Allétru 03 Nov '22

03 Nov '22

Hi folks, We need to use SNI with Dovecot at a relatively large scale and I was wondering if there's any update on the ability to: 1 - Lazy load SNI certificates when they are needed instead of loading them all at once during startup/reload, thus taking a lot of memory and being very slow. 2 - Not having to reload Dovecot every time a new domain cert is added in conf. 3 - Or at least have Dovecot keep processing clients while the slow reload happens. This has been asked already in a 2016 thread: https://www.dovecot.org/pipermail/dovecot/2016-November/106075.html. Regarding point 3 there's a reply from Aki saying it was in the internal tasklist ( https://www.dovecot.org/pipermail/dovecot/2016-November/106089.html) Anybody knows if some progress has been made on these subjects? I can't anything in the docs or any recent information anywhere else. Thanks, -- Pierre Allétru 06 70 55 08 35 pierre.alletru(a)gmail.com

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how to limit a global disk quota
by linuxguy＠gmx.net 03 Nov '22

03 Nov '22

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