June 2020 - dovecot - dovecot.org

INBOX folders disappeared after upgrading
by Dave 12 Jul '20

12 Jul '20

Hi, tried to Google/etc to see what to tweak.. not finding anything helpful. So.. I've been running my private mail through a Linux server since approx year 2000. The OS has been various flavors of Fedora or CentOS, since for work, I have to spend all day supporting some sort of Red Hat flavor. So I run SquirrelMail on top of Dovecot and Postfix on CentOS 7, things have been great for like forever. I recently ran updates and all my INBOX folders disappeared. I have made no configuration changes in at least 5 years. I can't seem to resolve/figure out what's going on. I have backups to see everything before the update. I've noticed that my subscriptions file is missing all the folders, which are all in this file in the backups. If I repopulate this file with the names, the next time I access mail, they are all removed. Most of my mail is in folders, therefore I have access to almost none of it (can see new stuff coming in, but can't sort it anywhere). k, for the details.. I was running dovecot-2.2.10 (2.2.10-8.el7.x86_64) and was updated to dovecot-2.2.36 (2.2.36-3.el7_7.1.x86_64) with yum updates. # dovecot --version 2.2.36 (1f10bfa63) # dovecot -n # 2.2.36 (1f10bfa63): /etc/dovecot/dovecot.conf # OS: Linux 3.10.0-1062.18.1.el7.x86_64 x86_64 CentOS Linux release 7.7.1908 (Core) # Hostname: vm1.tech...com auth_mechanisms = plain login login_greeting = IMAP ready. mail_location = maildir:~/Maildir mbox_write_locks = fcntl 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 { driver = pam } service auth { unix_listener /var/spool/postfix/private/auth { mode = 0600 user = postfix } } service imap-login { inet_listener imap { address = 127.0.0.1,68.139.25.150 } inet_listener imaps { address = 127.0.0.1,68.139.25.150 } } service pop3-login { inet_listener pop3 { port = 0 } inet_listener pop3s { address = 127.0.0.1,68.139.25.150 } } ssl = required ssl_cert = </etc/pki/tls/certs/mail.tech...com.crt ssl_cipher_list = ALL:!aNULL:!eNULL:!LOW:!EXP:!RC4 ssl_key = # hidden, use -P to show it ssl_prefer_server_ciphers = yes userdb { driver = passwd } Regards, -Dave

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2.3.10.1 on OpenBSD
by Rupert Gallagher 12 Jul '20

12 Jul '20

Apart from a few warnings (attached), and a bit of patience, the compiler terminates without error. On patience, OBSD has two processes who took almost half the CPU when compiling: reaper and zerothread. Will look into the warnings, and the testing errors (also attached). Let see how it works on this machine. OpenBSD 6.7 (GENERIC.MP) #2: Thu Jun 4 09:55:08 MDT 2020 real mem = 17125511168 (16332MB) avail mem = 16593879040 (15825MB) bios0: Supermicro A2SDi-4C-HLN4F OpenBSD clang version 8.0.1 (tags/RELEASE_801/final) (based on LLVM 8.0.1) Target: amd64-unknown-openbsd6.7 Thread model: posix

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Ms Exchange vs dovecot
by Marc Roos 10 Jul '20

10 Jul '20

I have recently been working/testing with exchange 2016 and started thinking if I should even migrate to this platform. I assume more people here have experience with exchange and this idea. I was wondering if this is possible with a dovecot setup 1. public folder can be implemented with a public mailbox? 2. authorize users via groups access to mailboxes/folders of the public folder/mailbox. I think I saw ACL's with dovecot, does this compare to 'folder permissions' 3. is it possible with sieve to apply a rule on any mailbox/folder? Thus if I 'drag' a message to a folder, the sieve rule is activated?

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dovecot: doveconf: Fatal: block_alloc(134217728): Out of memory
by Brent Clark 30 Jun '20

30 Jun '20

Good day Guys Currently on Debian Stretch (2.2.27). This morning we enabled SNI for our clients (file per domain). On going live with the new server configuration, we started getting the following on our shared hosting servers. Jun 30 07:25:04 REMOVED_HOSTNAME dovecot: doveconf: Fatal: block_alloc(134217728): Out of memory Jun 30 07:25:04 REMOVED_HOSTNAME dovecot: config: Fatal: block_alloc(134217728): Out of memory Jun 30 07:25:04 REMOVED_HOSTNAME dovecot: config: Fatal: master: service(config): child 64008 returned error 83 (Out of memory (service config { vsz_limit=512 MB }, you may need to increase it) - set CORE_OUTOFMEM=1 environment to get core dump) Jun 30 07:25:34 REMOVED_HOSTNAME dovecot: doveconf: Panic: data stack: Out of memory when allocating 2147483688 bytes Jun 30 07:25:37 REMOVED_HOSTNAME dovecot: config: Panic: data stack: Out of memory when allocating 2147483688 bytes This is a server with 2414 domains. On a few of our servers, to buy time, we had to set: default_vsz_limit =10096M A question I would like to ask is. Based on the following change notice, could the following be the problem. https://dovecot.org/pipermail/dovecot-news/2019-July/000412.html - config: Memory leak in config process when ssl_dh setting wasn't set and there was no ssl-parameters.dat file. This caused config process to die once in a while with "out of memory". If anyone could provide any assistance or share a tip on where we can look it would be appreciated. This one has my team and I stumped. Kind regards Brent Clark

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POP3Deleted flag issues
by Justina Colmena ~biz 29 Jun '20

29 Jun '20

Hello, I have been running my own mail server with Dovecot, Postfix, and Cyrus-SASL for authentication. = dovecot22u.x86_64 1:2.2.36.4-1.el7.ius @ius I am basically trying to tune the system for better performance. The flat files "/var/mail/justina" etc exhibit locking issues and conflicts when fetching mail at the same time new mail is being delivered by Postfix. Other mail is stored in "Maildir" type folders accessible via IMAP. These exhibit better performance with finer grained locking. There's an "idea" that was posted to the list 7 years ago, shows up top rank on Google. https://dovecot.org/pipermail/dovecot/2013-May/090114.html I fear either an incomplete implementation of the feature or "here-be-dragons" code that may or may not be completely documented. I would like all the "$POP3Deleted" mail to be moved to an "Archive" Maildir folder accessible via IMAP. How do I accomplish this? -- Sent from my Android device with K-9 Mail. Please excuse my brevity.

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layout:fs info
by Stefano Gatto - Fly2Net sas 28 Jun '20

28 Jun '20

Hi all, my dovecot version is 2.2.13, quite standard configuration. Can I add directive LAYOUT=fs in dovecot configuration without losing all my archived messages? This should modify the separator of email folders from dots to slashes, correct? BR Stefano

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Plugin ABI compat between v2.3.8 and v2.3.9
by Alexander Strasser 24 Jun '20

24 Jun '20

Hi all! This is my first post on this list. Please pardon me if I overlooked or misunderstood some things. I had some imap crashes (sig11) starting at the end of 2019 after an upgrade of dovecot. I found out, that I didn't have any problems using version v2.3.8, but any version v2.3.9 and higher would trigger the crashes. After investigating more deeply and creating a core dump, I saw that the crash happened in an external plugin fetchmail_wakeup[1]. After recompiling that plugin with up to date dovecot headers, I didn't get crashes anymore. So I suspect there were ABI incompatible changes and it was forgotten to bump the minimum Plugin-ABI version supported. I could try to follow up some more details, but it would be quite a burden because of rebuilding the plugin with debug symbols against version 2.3.8 of dovecot and triggering the crash etc. Despite that I think it should be possible to detect changes that are ABI incompatible, as otherwise plugin users would always have to find out first hand with unknown consequences. That said there could be a possibility of the plugin using the API/ABI in an invalid way. If that was the cause, then the plugin should be changed. Hope this report turns out to help improve the situation. I don't have problems currently and will in future be sensitive to this specific possible cause of problems, but not having such crashes in the first place, would be worth it and maybe could still help others. Best regards, Alexander 1: slightly reduced version of: https://github.com/marschap/fetchmail_wakeup

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Converting dot-namespaced Maildir to /-namespaced
by Guido Goluke, MajorLabel 24 Jun '20

24 Jun '20

I have a couple of domains on my server, all of them namespaced with a dot. It's 10-15 mailboxes at the most. Is there good way to convert them to / (slash) namespaced folders? Maybe some bash script lying around somewhere?

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dovecot fts configuration without solr
by Danilo Tomasoni 24 Jun '20

24 Jun '20

Hello All, I always used dovecot and I'm pretty happy with it, but recently I changed OS (to ubuntu 18) and to get dovecot LTS with lucene (the default I was using on my previous arch installation) I needed to build from source the version 2.3.10 (the one that came with the repos was older and clucene was not actually supported) The problem is that the Clucene is not behaving well, It indexes only some mails but definitely not all according to my tests (there are also strange assertion errors in the logs) I also tried xapian fts index but is very slow indexing and definitely doesn't seem to work. The problem with solr fts is that solr doesn't even start on my tiny system (odroid C2 with 2GB RAM) and anyway I don't want to bloat all the system for the indexing if possible.. Anyone can suggest me a proper minimal and working configuration? Thank you Danilo

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JMAP support
by Martynas Bendorius 23 Jun '20

23 Jun '20

Hello, Is there any ETA set for JMAP support? Thank you! >> On 11/27/2016 5:28 AM, Aki Tuomi <aki.tuomi at dovecot.fi> wrote: >> Hi! >> We are working on including JMAP support to Dovecot. At this moment I cannot give any promise for exact version, but hopefully it will be part of v2.3 >> >> Aki Tuomi >> Dovecot Oy -- Best regards, Martynas Bendorius

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