November 2021 - dovecot

Transfer or Archival of Dovecot Accounts
by Stefan Malte 02 Nov '21

02 Nov '21

Hello, We have the following situation: We are using Dovecot on several Mailservers administered via ISPConfig. The servers all use old versions of Debian and ISPConfig and my job - I joined the company as a Linux system administrator 6 months ago - is to consolidate these old servers into one new server I already set up. I did a trial run with one user from one company by way of duplicating her account on the new server, creating a new mail account in her outlook and changing the MX record from the old to the new server. This works. This was rather time-intensive and I still have to face the problem of what to do with the existing mail data once we shut down the old servers one-by-one. Is there a way to move or even better integrate the data from the old mailbox on the old server to the new mailbox on the new server without any user intervention? https://pypi.org/project/dovecot-archive/ looks promising, but it assumes a situation we don't have: In our case the original user and the user in whose mailbox the data should be stored have the same email address. I am very open to suggestions on how to do this the smart way. Even manually entering the users' account data by hand on the new server is very time consuming. At the same time this is a much needed opportunity to weed out old mailboxes and forwardings which are not used any more. Even complete domains on the old servers have proven to be not in use anymore - the client company switched to Exchange online according to the MX record and failed to inform us. Anyway, this is a huge load of work and I'd rather spend more time preparing correctly and efficiently repeating simple tasks again and again. I am grateful for any advice. After all, this situation is certainly not unique. Yours faithfully Stefan Malte Schumacher

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health check passthrough not 100% in combination with haproxy
by Marc 02 Nov '21

02 Nov '21

I have been trying to get a simple health check in haproxy to work. But somehome the haproxy request is differently handled then a curl request, which generates a socket error in haproxy. The health script echos these lines, with this config[2] echo -ne "HTTP/1.1 200 OK\r\n" echo -ne "Content-Length: 0\r\n" echo -ne "\r\n" exit 0 The curl request generates ok, haproxy generates socket error. The haproxy=yes, reuseport=yes do not seem to resolve anything. If stop dovecot and run "dovecot-health-check.sh | nc -l 192.168.10.46 5001" then the haproxy check is ok. So I guess the script is ok. But what is dovecot then doing with it's output when haproxy is requesting it? [1] https://discourse.haproxy.org/t/httpck-on-bash-script-results-in-socket-err… [2] service health-check { executable = script -p /usr/local/sbin/dovecot-health-check.sh inet_listener health-check { port = 5001 haproxy = no reuse_port = no } }

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Ldap dict for shared mailboxes
by Kees van Vloten 02 Nov '21

02 Nov '21

Hi everybody, I am trying to construct a LDAP dict for shared mailboxes. There is a lot of documentation available but nothing specific to this usecase. I could not find anything useful on Google nor in the mailinglist archives :-( The best start point seems to be the doc on shared mailbox dictionaries (https://doc.dovecot.org/configuration_manual/shared_mailboxes/shared_mailbo…), in particular the example for SQL dict. But obviously LDAP is different than SQL. The dictionaries page (https://doc.dovecot.org/configuration_manual/dict/) has LDAP example but it looks like it does not contain all the bit and pieces I need. Following the structure of the SQL example, I come to something like this: map { pattern = shared/shared-boxes/user/$to/$from base_dn = ou=shared mailboxes,dc=example,dc=com filter = (&(objectClass=group)(mail=%{from}) fields { from_user=$from to_user=$to } } The "to_user" / "$to" should be filled with the 'uid' or 'email' of a nested group lookup of the 'member' fields of the group. What are the mechanics to get that done? Does anyone has an example or pointer to documentation or is a LDAP dict for shared-mailboxes not possible / supported? And in the latter case, suggestions about possible alternatives are welcome :-) FYI. the LDAP implementation I am using is a recent Samba4 ad-dc. - Kees.

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limiting cpu time of dovecot/imap
by Marc 01 Nov '21

01 Nov '21

What would be the best way to 'throttle' dovecot/imap processes of specific users?

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Dovecot does not start on MacOS 12.01
by Don Feliciano 01 Nov '21

01 Nov '21

I've been happily running Dovecot on my Mac for many years (installed via Homebrew). After upgrading to Monterey (MacOS 12.01), it no longer starts: $ sw_vers ProductName: macOS ProductVersion: 12.0.1 BuildVersion: 21A559 $ uname -a Darwin dfelicia-mac 21.1.0 Darwin Kernel Version 21.1.0: Wed Oct 13 17:33:23 PDT 2021; root:xnu-8019.41.5~1/RELEASE_X86_64 x86_64 $ sudo dovecot -F Oct 27 10:11:18 service(log): Fatal: setrlimit(RLIMIT_DATA, 268435456): Invalid argument $ mount /dev/disk1s2s1 on / (apfs, sealed, local, read-only, journaled) devfs on /dev (devfs, local, nobrowse) /dev/disk1s5 on /System/Volumes/VM (apfs, local, noexec, journaled, noatime, nobrowse) /dev/disk1s3 on /System/Volumes/Preboot (apfs, local, journaled, nobrowse) /dev/disk1s6 on /System/Volumes/Update (apfs, local, journaled, nobrowse) /dev/disk1s1 on /System/Volumes/Data (apfs, local, journaled, nobrowse) $ sudo dovecot -n # 2.3.16 (7e2e900c1a): /usr/local/etc/dovecot/dovecot.conf # Pigeonhole version 0.5.16 (09c29328) # OS: Darwin 21.1.0 x86_64 apfs # Hostname: dfelicia-mac default_internal_group = mail default_internal_user = _dovecot default_login_user = _dovenull first_valid_uid = 100 listen = 127.0.0.1 log_path = /var/log/dovecot.log mail_location = maildir:/usr/local/var/mail/%u 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 mime foreverypart extracttext namespace inbox { inbox = yes location mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix } passdb { args = login driver = pam } protocols = imap service imap-login { inet_listener imap { address = 127.0.0.1 port = 143 } inet_listener imaps { address = 127.0.0.1 ssl = no } } ssl = no userdb { driver = passwd } $ ulimit -Ha core file size (blocks, -c) unlimited data seg size (kbytes, -d) unlimited file size (blocks, -f) unlimited max locked memory (kbytes, -l) unlimited max memory size (kbytes, -m) unlimited open files (-n) unlimited pipe size (512 bytes, -p) 1 stack size (kbytes, -s) 65532 cpu time (seconds, -t) unlimited max user processes (-u) 2784 virtual memory (kbytes, -v) unlimited

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2.3.17 - breaks with fts-xapian.
by Juan Felipe Arjona 01 Nov '21

01 Nov '21

Hello: I just upgraded my Debian server with dovecot 2.3.17, and it breaks when using the plugin fts-xapian. Apparently is a bug in Dovecot, please see: https://github.com/grosjo/fts-xapian/issues/99 Thanks, Juan

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Errors after freebsd upgrade
by Hanns Mattes 01 Nov '21

01 Nov '21

Hi, after upgrading Freebsd from ports dovecot is throwing the following error Oct 30 18:04:15 freebsd dovecot[59232]: doveadm(xxx(a)example.com)<84061><S3CoJf9sfWFdSAEAUmejdw>: Fatal: master: service(doveadm): child 84061 killed with signal 6 (core not dumped - https://dovecot.org/bugreport.html#coredumps - set service doveadm { drop_priv_before_exec=yes }) I (surely) may have missed something while upgrading (I've learned a lot about backup/snapshot-strategies with zfs, but to late to apply). How can I debug the erro? Regards Hanns

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