- dovecot - dovecot.org

Question about custom flags
by d.meister-braeuer＠heinlein-support.de 09 Aug '23

09 Aug '23

Hello all, RFC3501 describes among other things that custom flags can be set for mails. These can be allowed or forbidden in the server: "Servers MAY permit the client to define new keywords in the mailbox". When I am on our server, it also looks like dovecot basically allows this: a select INBOX FLAGS (\Answered \Flagged \Deleted \Seen \Draft $Forwarded Old $ITipAnalyzed $ITipProcessed Forwarded NonJunk $cl_1 $cl_2 $cl_3) OK [PERMANENTFLAGS (\Answered \Flagged \Deleted \Seen \Draft $Forwarded Old $ITipAnalyzed $ITipProcessed Forwarded NonJunk $cl_1 $cl_2 $cl_3 \*)] Flags permitted. The only option that goes in this direction is this one: mail_max_keyword_length But basically describes something else as well, if I see it correctly. Is there a way to prevent dovecot from giving custom flags, or what is the name of the parameter where you can set this? Best

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Outlook not showing all email in inbox at random
by David Koski 09 Aug '23

09 Aug '23

I manage IT for a small office with about 10 workstations. Dovecot has been installed for years and is now at 2.3.4.1-5 (Debian). I just discovered that the user cannot see many emails in the inbox. I was alerted when email was not appearing to be coming in for many hours. Other users observed the same thing. On investigation, I noticed many inbox emails missing in the Outlook GUI from times past that were on the server. It appears to be a broken client (Outlook 2019) to me but troubleshooting has yielded no solid leads. The profile and OST files have been re-created many times with no change in outcome. Each time, the inbox does not synchronize about 40 most recent emails but does for the last one for the day before and many before that. It may well be an Outlook issue so I'm looking for information to work around an Outlook bug if necessary. Thunderbird works perfectly. Also, interestingly, I can copy email from Thunderbird (or move emails on the server) to a temporary directory form the inbox, then move them back and they will appear if I don't move too many at a time. Regards, David Koski dkoski(a)sutinen.com

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Application to automate mail-crypt plugin with user keys
by Benedikt Zumtobel 08 Aug '23

08 Aug '23

Hi everyone, I run a very small (about 10 users) mailserver setup with the mail-crypt plugin activated and wanted to transition from a global key setup to user keys. Since I couldn't find a satisfying solution to reencrypt mailboxes when users change their password I started writing a script that ended up being a small webservice giving users a simple selfservice portal to change their password. I consider it pretty much done by now and it's public on github. Maybe it's useful for somebody else. However its use case is very narrow since I initially wrote this just for myself. It does only support a Postgres user store for instance. The main reason, however, for this post is me wondering if anybody would bother to give me some feedback. Especially for the following aspects: I execute doveadm from within my application. The advantage is that I can keep the code very light (~650 lines of code) while at the same time don't have to care about the crypto stuff which I wouldn't dare trying anyways. The disadvantage of this approach is that I had to write a doveadm wrapper that needs the setuid bit to execute doveadm mailbox commands. I consider this a bit hacky but a better solution didn't come to my mind. Another aspect is the password that is being used to encrypt the private key. When creating a new user in the database I generate a unique salt. This salt is prefixed to the user's clear text password and the resulting string is run trough the sha3-512 hash function. The output is the mail_crypt_private_password. You find the project here: https://github.com/nonce9/pwch Criticism is welcome. Benedikt

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Dovecot bug submit - Dovecot stats
by Brent Clark 07 Aug '23

07 Aug '23

Good day Guys Just a brief background, Im looking to enable and run doveadm stats, as per https://doc.dovecot.org/configuration_manual/stats/ When I run the command: doveadm stats add --description "IMAP SELECT commands" --exporter log-exporter --exporter-include "name timestamps" --fields "bytes_in bytes_out" --group-by "cmd_name tagged_reply_state" imap_cmd_select "event=imap_command_finished AND name=SELECT" I get: ==> /var/log/mail.info <== Aug 3 05:52:36 bullseye dovecot: stats: Error: Raw backtrace: /usr/lib/dovecot/libdovecot.so.0(backtrace_append+0x42) [0x7f08c7097582] -> /usr/lib/dovecot/libdovecot.so.0(backtrace_get+0x1e) [0x7f08c709769e] -> /usr/lib/dovecot/libdovecot.so.0(+0x1022fb) [0x7f08c70a42fb] -> /usr/lib/dovecot/libdovecot.so.0(+0x102391) [0x7f08c70a4391] -> /usr/lib/dovecot/libdovecot.so.0(+0x55589) [0x7f08c6ff7589] -> dovecot/stats(+0x5aa5) [0x561765217aa5] -> dovecot/stats(stats_metrics_add_dynamic+0x11f) [0x56176521a80f] -> dovecot/stats(+0x6724) [0x561765218724] -> /usr/lib/dovecot/libdovecot.so.0(connection_input_default+0x155) [0x7f08c709bd05] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x69) [0x7f08c70ba529] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0x132) [0x7f08c70bbc12] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x50) [0x7f08c70ba5d0] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_run+0x40) [0x7f08c70ba790] -> /usr/lib/dovecot/libdovecot.so.0(master_service_run+0x13) [0x7f08c702d353] -> dovecot/stats(main+0x128) [0x561765217e38] -> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xea) [0x7f08c6ca8d0a] -> dovecot/stats(_start+0x2a) [0x561765217eba] ==> /var/log/mail.warn <== Aug 3 06:23:51 bullseye dovecot: stats: Fatal: master: service(stats): child 38121 killed with signal 6 (core dumped) I installed and run systemd-coredump, dovecot-sysreport Please will you take a look at the various attached files (coredumps etc) Many thanks. Kind Regards Brent Clark

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doveadm fts lookup: Is "search query" documented anywhere?
by Graham Leggett 07 Aug '23

07 Aug '23

Hi all, According to the —help option for doveadm fts, there is a “lookup” option as follows: [root@aurora ~]# doveadm fts --help usage: doveadm [-Dv] [-f <formatter>] fts <command> [<args>] expand [-u <user>|-A] [-S <socket_path>] <search query> lookup [-u <user>|-A] [-S <socket_path>] <search query> optimize [-u <user>|-A] [-S <socket_path>] [<namespace>] rescan [-u <user>|-A] [-S <socket_path>] [<namespace>] tokenize [-u <user>|-A] [-S <socket_path>] <text> The option does not appear to be documented anywhere (eg https://doc.dovecot.org/3.0/man/doveadm-fts.1/) and “search query” doesn’t appear to be defined. Guessing that it might be just plain text, I tried searching for a known word, but this failed as follows: [root@aurora ~]# doveadm fts lookup -u test(a)example.com sweet Fatal: Unknown argument SWEET Anyone know? Regards, Graham —

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Trash deleted date?
by joe a 07 Aug '23

07 Aug '23

Using Thunderbird client. Cannot sort "Trash" Folder by time/date deleted. I can display both "Received" and "Date" columns, but they show identical data. Does dovecot create a "deleted" time stamp? dovecote 2.3.20 (80a5ac675d) TB 102.14.0 64 bit

1 0

passwdb deny.ip
by mauric＠gmx.ch 06 Aug '23

06 Aug '23

Hello i understod in the last discussion thread <Forcing imap authentication failure for certain IP addresses> that also IP can be filter, ok the ip are available in deny.ip. Please why this are not blocked? # dovecot version 2.3.4.1 (f79e8e7e4) passdb { args = /etc/dovecot/deny.ip args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } cat mail.log | grep 'sql(name,' Aug 06 01:29:11 Dovecot/auth-worker(7927): Info: sql(Name,A.B.232.146): unknown user # cat deny.ip | grep A.B.232.146 A.B.232.146 meny thanks

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mail-crypt long-term support? How to backup?
by eaerhaerhaehae aehraerhaeha 05 Aug '23

05 Aug '23

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Dovecot shared folders - examples of the "doveadm acl" command?
by Graham Leggett 05 Aug '23

05 Aug '23

Hi all, The old wiki has been taken down, and all the links I can find through google are now broken. Does anyone have a concrete example of “doveadm acl” to grant someone access to a shared folder? Regards, Graham —

2 2

fail2ban / ldap login failure
by micha＠micha.waw.pl 05 Aug '23

05 Aug '23

[Debian Bookworm + Dovecot 2] I have user database in ldap (samba). I want to use fail2ban to restrict unsuccessful login attempts, but... I cannot see "Authentication failure" message in ANY log. (/var/log/mail.log shows successful logins as well as disconnects.) How should I proceed?

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