April 2026 - dovecot - dovecot.org

Dovecot 2.4 SETQUOTA, how to allow (admin) users to set quota (and write it back to LDAP)
by Johannes Nohl 20 Apr '26

20 Apr '26

Is it true that Dovecot dismissed the functionality of SETQUOTA with version 2.4.0 - without any replacement? see https://dovecot.org/mailman3/archives/list/dovecot-news@dovecot.org/message… Does this also applies to 2.4.2 and 2.4.3, or does the mechanism of plugin imap_quota returned (manual reads that there are no options to this plugin)? IMAP always replies `c008 NO [NOPERM] Permission denied (0.001 + 0.000 secs).` If you can activate the former `quota_set` option, how to combine it with LDAP? I know that you can read Quota from LDAP with userdb field `quota_storage_size = {ldap:quotaBytes}B`. But how to set it? I also remember an old opinion that writing LDAP is to slow, you should store quota e.g. in a text file and write it back to LDAP time shifted. That would be fine for me - however, how to enable SETQUOTA then? Thank you for help. -- Johannes Nohl postmaster(a)i-t-cloud.de

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Config: Reading value from file for password does not work
by René Neumann 19 Apr '26

19 Apr '26

Hi, I want to read the ldap auth-dn password from a file to avoid having it as part of the configuration (which may be checked into VCS). I specified ldap_auth_dn_password = </some/file where /some/file contains the password without extra whitespace (esp. there is no `\n`, I checked with xxd). But ldap auth does not succeed because of a wrong password. Password itself does work though, as checked with ldapsearch (even using the same file as password provider) `doveconf -x -P` *does* show the correct value. The same issue has been reported back in 2019 [1], without any reply though :-/ Any ideas? Thanks, René [1] https://dovecot.org/list/dovecot/2019-September/117100.html

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[Bug Report] 2.4.3 on macOS: anvil panics at anvil-connection.c:727 on every IMAP client handshake
by I-K-D-T＠web.de 18 Apr '26

18 Apr '26

Hi Dovecot developers, I'm hitting a reproducible anvil panic on macOS when any IMAP client tries to connect. Every client handshake triggers an `i_unreached()` assertion in `anvil-connection.c:727`, causing the anvil child to be killed with SIGABRT. Dovecot keeps restarting anvil, but every subsequent connection attempt triggers the same panic, so the service effectively cannot accept logins. ## Environment - Dovecot: 2.4.3 (e278b1e09b), Pigeonhole 2.4.3 (0bf9ee48) -- from Homebrew - OS: macOS 15.6 (Sequoia, Darwin 24.6.0, arm64/Apple Silicon, APFS) - Mail client: Mozilla Thunderbird 149.0.2 - Dovecot started via `sudo brew services start dovecot` (launchd) ## Reproducing 1. Fresh macOS install of Dovecot 2.4.3 via Homebrew. 2. Configure a minimal single-user IMAP setup with `passdb static` / `userdb static`, SSL on port 993 with a self-signed cert, Maildir storage (config at end of this mail). 3. Start Dovecot as root via launchd (`sudo brew services start dovecot`). 4. Connect any IMAP client to localhost:993 (I used Thunderbird 149 with a permanent cert exception for the self-signed certificate). 5. The client hangs / reports "server closed the connection" / sees no folders. 6. `dovecot.log` fills with repeated entries like the following: ``` anvil: Warning: conn unix:anvil (uid=0): Handshake with duplicate service=imap-login pid=-1 - replacing the old connection anvil: Panic: file anvil-connection.c: line 727: unreached anvil: Error: Raw backtrace: 0 libdovecot.0.dylib backtrace_append + 72 -> 1 libdovecot.0.dylib backtrace_get + 44 -> 2 libdovecot.0.dylib default_fatal_finish + 72 -> 3 libdovecot.0.dylib default_error_handler -> 4 libdovecot.0.dylib i_internal_error_handler -> 5 libdovecot.0.dylib i_fatal -> 6 libdovecot.0.dylib default_write -> 7 anvil anvil_connection_input_line -> 8 libdovecot.0.dylib connection_input_read_stream + 196 -> 9 libdovecot.0.dylib connection_input_default + 72 -> 10 libdovecot.0.dylib io_loop_call_io + 116 -> 11 libdovecot.0.dylib io_loop_handler_run_internal + 284 -> 12 libdovecot.0.dylib io_loop_handler_run + 220 -> 13 libdovecot.0.dylib io_loop_run + 88 -> 14 libdovecot.0.dylib master_service_run + 292 -> 15 anvil main + 368 -> 16 dyld start + 6076 anvil: Fatal: master: service(anvil): child NNNN killed with signal 6 (core dumps disabled) ``` The key signature is the two-line sequence: ``` Warning: conn unix:anvil (uid=0): Handshake with duplicate service=imap-login pid=-1 - replacing the old connection Panic: file anvil-connection.c: line 727: unreached ``` Every IMAP client handshake produces this. The `pid=-1` in the handshake warning looks suspicious -- it appears anvil is either not receiving a valid pid from imap-login or is registering a second connection with the same service name before the first is cleaned up. ## Workarounds attempted (none succeeded) - User-level setup with default_login_user=andreas -> same panic - Root-level setup with default_login_user=andreas -> same panic - Root-level setup with default_login_user=_www (unprivileged macOS service account with uid=70) -> same panic - Adding `default_vsz_limit = unlimited` (required separately on macOS because setrlimit(RLIMIT_DATA) fails with EINVAL on Darwin) -> did not affect anvil - Plaintext IMAP on 143 (no TLS) vs. IMAPS on 993 with self-signed cert -> same panic in both - Restarting Dovecot via launchd (`sudo brew services stop/start dovecot`) -> the panic recurs on the next connection ## `doveconf -n` output ``` # 2.4.3 (e278b1e09b): /opt/homebrew/etc/dovecot/dovecot.conf # Pigeonhole version 2.4.3 (0bf9ee48) # OS: Darwin 24.6.0 arm64 apfs # Hostname: macbook-air-von-andreas.local dovecot_config_version = 2.4.3 auth_mechanisms = plain login default_internal_group = _www default_internal_user = _www default_login_user = _www default_vsz_limit = unlimited dovecot_storage_version = 2.4.3 info_log_path = /opt/homebrew/var/log/dovecot/dovecot-info.log listen = 127.0.0.1 log_path = /opt/homebrew/var/log/dovecot/dovecot.log mail_driver = maildir mail_gid = staff mail_home = /Users/andreas/mail/%{user} mail_path = /Users/andreas/mail/%{user} mail_uid = andreas protocols = imap ssl_server { cert_file = /opt/homebrew/etc/dovecot/ssl/dovecot.crt key_file = /opt/homebrew/etc/dovecot/ssl/dovecot.key } service imap-login { inet_listener imap { port = 143 } inet_listener imaps { port = 993 ssl = yes } } passdb static { password = # hidden } userdb static { fields { gid = staff home = /Users/andreas/mail/%{user} uid = andreas } } namespace inbox { mailbox_list_layout = fs inbox = yes prefix = separator = / } ``` ## What I would expect The anvil connection from imap-login should register with a valid pid (not -1) or anvil should tolerate the re-registration gracefully instead of hitting an i_unreached() assertion. ## Note on `dovecot-sysreport` Running `dovecot-sysreport` as the normal user fails with permission errors on `/opt/homebrew/var/run/dovecot/*` sockets (log-errors, master). The `grep -P` usage inside the script also fails on BSD grep (macOS). Let me know if a sysreport archive would be useful -- I can re-run with sudo and adjust grep if needed. Happy to provide further reproduction details, additional log output, or test any fix suggestions. Thanks for Dovecot. Andreas Marth I-K-D-T(a)web.de

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still a compile error in 2.4.3
by matthias 14 Apr '26

14 Apr '26

Hi, I got this message while I compile the version 2.4.3: libtool: error: cannot find the library '../../src/lib-lua/libdovecot-lua.la' or unhandled argument '../../src/lib-lua/libdovecot-lua.la' Thanks Matthias

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INBOX.dovecot.sieve not selectable
by 87auteur-niobium＠icloud.com 14 Apr '26

14 Apr '26

Hi folks, I’m seeing “INBOX.dovecot.sieve” listed on the response of the IMAP LIST command, but attempting to select the mailbox fails with “Internal server error occurred. Refer to the server log for more information”. I assume INBOX.dovecot.sieve is an internal/system folder that shouldn’t be on the LIST response. Is this a known issue? If it is, is it being tracked anywhere (I don’t see an “Issues” tab on GitHub for Dovecot Core)?

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imap-login not passing DSN through
by Hadmut Danisch 14 Apr '26

14 Apr '26

Hi, I have a problem with postfix + dovecot 1:2.3.21+dfsg1-2ubuntu6.3 on Ubuntu Server 24.04: When using dovecot's imap-login to verify users and passwords againgst dovecot's user list, it doesn't pass the DSN flag through, therefore effectively disabling DSN. Postfix, submission port bound to 127.0.0.1, port 587: 250-myhostname 250-PIPELINING 250-SIZE 18432000 250-ETRN 250-STARTTLS 250-ENHANCEDSTATUSCODES 250-8BITMIME 250-DSN 250-SMTPUTF8 250 CHUNKING but imap-login (configured to forward to 127.0.0.1:587): 250-myhostname 250-8BITMIME 250-AUTH PLAIN 250-BURL imap 250-CHUNKING 250-ENHANCEDSTATUSCODES 250-SIZE 250 PIPELINING So both the size limit and DSN are not passed through, SMTPUTF8 either. Even setting imap_capability = +DSN in 20-imap.conf doesn't help. What is keeping dovecot's imap-login from offering DSN? best regards Hadmut Hi, I have a problem with postfix + dovecot 1:2.3.21+dfsg1-2ubuntu6.3 on Ubuntu Server 24.04: When using dovecot's imap-login to verify users and passwords againgst dovecot's user list, it doesn't pass the DSN flag through, therefore effectively disabling DSN. Postfix, submission port bound to 127.0.0.1, port 587: 250-myhostname 250-PIPELINING 250-SIZE 18432000 250-ETRN 250-STARTTLS 250-ENHANCEDSTATUSCODES 250-8BITMIME 250-DSN 250-SMTPUTF8 250 CHUNKING but imap-login (configured to forward to 127.0.0.1:587): 250-myhostname 250-8BITMIME 250-AUTH PLAIN 250-BURL imap 250-CHUNKING 250-ENHANCEDSTATUSCODES 250-SIZE 250 PIPELINING So both the size limit and DSN are not passed through, SMTPUTF8 either. Even setting imap_capability = +DSN in 20-imap.conf doesn't help. What is keeping dovecot's imap-login from offering DSN? best regards Hadmut

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doveadm batch crash
by Jonathan Casiot 13 Apr '26

13 Apr '26

Hi I'm having an issue with doveadm batch - the following command always crashes: doveadm batch : mailbox status all inbox Whereas the following work as expected: doveadm mailbox status all inbox doveadm batch : mailbox list Any assistance gratefully received. Debug output from the crash: Debug: Loading modules from directory: /usr/lib64/dovecot Debug: Module loaded: /usr/lib64/dovecot/lib01_acl_plugin.so Debug: Module loaded: /usr/lib64/dovecot/lib10_mail_crypt_plugin.so Debug: Module loaded: /usr/lib64/dovecot/lib90_stats_plugin.so Debug: Loading modules from directory: /usr/lib64/dovecot/doveadm Debug: Module loaded: /usr/lib64/dovecot/doveadm/lib10_doveadm_acl_plugin.so Debug: Skipping module doveadm_expire_plugin, because dlopen() failed: /usr/lib64/dovecot/doveadm/lib10_doveadm_expire_plugin.so: undefined symbol: expire_set_deinit (this is usually intentional, so just ignore this message) Debug: Skipping module doveadm_quota_plugin, because dlopen() failed: /usr/lib64/dovecot/doveadm/lib10_doveadm_quota_plugin.so: undefined symbol: quota_user_module (this is usually intentional, so just ignore this message) Debug: Skipping module doveadm_fts_lucene_plugin, because dlopen() failed: /usr/lib64/dovecot/doveadm/lib20_doveadm_fts_lucene_plugin.so: undefined symbol: lucene_index_iter_deinit (this is usually intentional, so just ignore this message) Debug: Skipping module doveadm_fts_plugin, because dlopen() failed: /usr/lib64/dovecot/doveadm/lib20_doveadm_fts_plugin.so: undefined symbol: fts_user_get_language_list (this is usually intentional, so just ignore this message) Debug: Module loaded: /usr/lib64/dovecot/doveadm/libdoveadm_mail_crypt_plugin.so doveadm(jc): Debug: Effective uid=1001, gid=100, home=/home/jc doveadm(jc): Debug: acl: No acl_shared_dict setting - shared mailbox listing is disabled doveadm(jc): Debug: mail_crypt_plugin: mail_crypt_curve setting missing - generating EC keys disabled doveadm(jc): Debug: Namespace inbox: type=private, prefix=, sep=., inbox=yes, hidden=no, list=yes, subscriptions=yes location=mdbox:~/mdbox:ALT=~/Archive/tape/mdbox doveadm(jc): Debug: fs: root=/home/jc/mdbox, index=, indexpvt=, control=, inbox=, alt=/home/jc/Archive/tape/mdbox doveadm(jc): Debug: acl: initializing backend with data: vfile doveadm(jc): Debug: acl: acl username = jc doveadm(jc): Debug: acl: owner = 1 doveadm(jc): Debug: acl vfile: Global ACLs disabled doveadm(jc): Panic: file mail-storage.c: line 875 (mailbox_set_reason): assertion failed: (reason != NULL) doveadm(jc): Error: Raw backtrace: /usr/lib64/dovecot/libdovecot.so.0(+0xa0e9e) [0x7fc993023e9e] -> /usr/lib64/dovecot/libdovecot.so.0(default_fatal_handler+0x2a) [0x7fc993023f0a] -> /usr/lib64/dovecot/libdovecot.so.0(i_fatal+0) [0x7fc992fb3c97] -> /usr/lib64/dovecot/libdovecot-storage.so.0(+0x49856) [0x7fc993301856] -> /usr/bin/doveadm(+0x348e2) [0x5631dbb5f8e2] -> /usr/bin/doveadm(+0x2e1ad) [0x5631dbb591ad] -> /usr/bin/doveadm(+0x2bd2c) [0x5631dbb56d2c] -> /usr/bin/doveadm(+0x2c92a) [0x5631dbb5792a] -> /usr/bin/doveadm(doveadm_mail_try_run+0x215) [0x5631dbb58285] -> /usr/bin/doveadm(main+0x46a) [0x5631dbb473fa] -> /lib64/libc.so.6(__libc_start_main+0xf5) [0x7fc992bd83d5] -> /usr/bin/doveadm(+0x1c565) [0x5631dbb47565] Aborted (core dumped) And doveconf -n output: # 2.2.36 (1f10bfa63): /etc/dovecot/dovecot.conf # OS: Linux 3.10.0-957.1.3.el7.x86_64 x86_64 CentOS Linux release 7.6.1810 (Core) # Hostname: ### redacted ### first_valid_gid = 100 first_valid_uid = 1000 last_valid_gid = 100 last_valid_uid = 1999 listen = * login_greeting = IMAP ready login_log_format_elements = user=<%u> method=%m rip=%r lip=%l mpid=%e session=<%{session}> %k mail_attribute_dict = file:%h/mdbox/dovecot-attributes mail_location = mdbox:~/mdbox:ALT=~/Archive/tape/mdbox mail_plugins = acl stats mail_crypt mailbox_list_index = yes mdbox_rotate_size = 16 M 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 = separator = . } passdb { driver = pam } plugin { acl = vfile mail_crypt_global_private_key = <### redacted ### mail_crypt_global_public_key = <### redacted ### mail_crypt_save_version = 2 stats_memory_limit = 16 M stats_refresh = 30 secs stats_track_cmds = yes } postmaster_address = ### redacted ### protocols = imap service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } } service imap-login { process_limit = 200 process_min_avail = 4 service_count = 1 } service stats { fifo_listener stats-mail { group = users mode = 01224 } } ssl = required ssl_cert = <### redacted ### ssl_key = # hidden, use -P to show it ssl_prefer_server_ciphers = yes ssl_protocols = !SSLv2 !SSLv3 !TLSv1 userdb { driver = passwd } verbose_proctitle = yes protocol imap { imap_idle_notify_interval = 10 mins imap_metadata = yes mail_max_userip_connections = 20 mail_plugins = acl stats mail_crypt imap_acl imap_stats } Regards, -- Jonathan

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decode2text
by Joan Moreau 13 Apr '26

13 Apr '26

Hi I can't find decode2text.sh in the git Where is it maintained ? Thank you Joan Hi I can't find decode2text.sh in the git Where is it maintained ? Thank you Joan

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Fwd: [EXT] In Yocto-Mailinglist, there were two version of dovecot 2.4.3 found?
by Martin Maurer 10 Apr '26

10 Apr '26

Hello, resent to get clarification, about different content of 2.4.3 release tar file Best regards, Martin -------- Weitergeleitete Nachricht -------- Betreff: Re: [EXT] In Yocto-Mailinglist, there were two version of dovecot 2.4.3 found? Datum: Fri, 10 Apr 2026 14:37:36 +0300 (EEST) Von: Aki Tuomi <aki.tuomi(a)open-xchange.com> An: Martin Maurer <martin.maurer(a)mmeacs.de> Kopie (CC): dovecot-owner(a)dovecot.org <dovecot-owner(a)dovecot.org> Please send mails to dovecot(a)dovecot.org, which is our public mailing list. Aki > On 10/04/2026 14:18 EEST Martin Maurer <martin.maurer(a)mmeacs.de> wrote: > > Hi, > > in Yocto mailing list there was found out, that two different version > of dovecot 2.4.3 seems to exist: > > > https://github.com/dovecot/core/releases/download/2.4.3/dovecot-2.4.3.tar.gz > > > sha256:e0b30330fe51e47ecfcf641bc16041184d91bdd0ac3db789b7cef54e3a75ac9b > > > https://dovecot.org/releases/2.4/dovecot-2.4.3.tar.gz > > SHA256: ff0be85228122f250627b19e67505fdb7fb2f72a702ef6bf35f27fce54c072e5 > > > When downloading both and comparing them: > > The doc/man directory seem to be different. > > When I had looked correctly, all others files seems to be identical. > > > Can you explain, what could have happened? > > In Yocto the SHA256 checksum is checked, and this seems to fail, when > the one or the other download place is used. > > Is this as planned or had an error happened? > > > Many thanks for the clarification! > > > Best regards, > > Martin Hello, resent to get clarification, about different content of 2.4.3 release tar file Best regards, Martin -------- Weitergeleitete Nachricht -------- Betreff: Re: [EXT] In Yocto-Mailinglist, there were two version of dovecot 2.4.3 found? Datum: Fri, 10 Apr 2026 14:37:36 +0300 (EEST) Von: Aki Tuomi [1]<aki.tuomi(a)open-xchange.com> An: Martin Maurer [2]<martin.maurer(a)mmeacs.de> Kopie (CC): [3]dovecot-owner(a)dovecot.org [4]<dovecot-owner(a)dovecot.org> Please send mails to [5]dovecot(a)dovecot.org, which is our public mailing list. Aki On 10/04/2026 14:18 EEST Martin Maurer [6]<martin.maurer(a)mmeacs.de> wrote: Hi, in Yocto mailing list there was found out, that two different version of dovecot 2.4.3 seems to exist: [7]https://github.com/dovecot/core/releases/download/2.4.3/dovecot-2.4.3.tar… sha256:e0b30330fe51e47ecfcf641bc16041184d91bdd0ac3db789b7cef54e3a75ac9b [8]https://dovecot.org/releases/2.4/dovecot-2.4.3.tar.gz SHA256: ff0be85228122f250627b19e67505fdb7fb2f72a702ef6bf35f27fce54c072e5 When downloading both and comparing them: The doc/man directory seem to be different. When I had looked correctly, all others files seems to be identical. Can you explain, what could have happened? In Yocto the SHA256 checksum is checked, and this seems to fail, when the one or the other download place is used. Is this as planned or had an error happened? Many thanks for the clarification! Best regards, Martin References Visible links 1. mailto:aki.tuomi@open-xchange.com 2. mailto:martin.maurer@mmeacs.de 3. mailto:dovecot-owner@dovecot.org 4. mailto:dovecot-owner@dovecot.org 5. mailto:dovecot@dovecot.org 6. mailto:martin.maurer@mmeacs.de 7. https://github.com/dovecot/core/releases/download/2.4.3/dovecot-2.4.3.tar.gz 8. https://dovecot.org/releases/2.4/dovecot-2.4.3.tar.gz

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Source tarballs for dovecot 2.4.3 republished
by Aki Tuomi 10 Apr '26

10 Apr '26

Hi! We have republished the source tarballs for 2.4.3 due to missing man pages in the tarball. Regards, AKi

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