- dovecot - dovecot.org

Can dovecot sieve query a database file?
by Hadmut Danisch 05 Oct '25

05 Oct '25

Hi, can dovecot sieve query any external database ( berkeley database file, rest api, whatever) to determine the target folder by sender address? Background: I have to migrate a mailbox from an old ubuntu system running with mailfilter as a local delivery agent, and dovecot just as an IMAP server. Since recent ubuntu versions do not have mailfilter anymore (abandoned for a decade) I need to substitute the mailfilter file with dovecot sieve. The old mailfilter script contained something like if (gdbmopen(".mailfilter.gdbm", "R") == 0) { if ( (box=gdbmfetch(tolower($FROM),"D")) ne "" ) to $box if ( /^From: .*<(.*)>/ ) { if ( (box=gdbmfetch(tolower($MATCH1),"D")) ne "" ) to $box } gdbmclose } which allowed to sort mails into mailboxes depending on the sender for hundreds of sender addresses in a fast end efficient way. It wouldn't make sense and be too slow to translate this into a sieve script with a thousand if header :matches ... elsif header :matches ... Is there a way to do this efficently in dovecot's sieve? regards Hadmut

2 1

Message duplication in Sent folder after upgrade
by Oliver Welter 04 Oct '25

04 Oct '25

Hi All, I have migrated my mailserver (from dovecot 2.2 on debian 10 to dovecot 2.3 provided by the mailcow-dockerized project) by coping over the mailstorage directory "as is". There is now a single mailbox where I have an issue with duplicated mails - the "Sent" folder had approx 400 mails upon migration, it now has 4500 mails with each mail duplicated several times. Below are the header lines of one message, besides the Message-Id the header is exactly the same on all copies. I tried "doveadm force-resync" on the mailbox and the mailbox was removed and recreated from scratch on the mail app but we still get additional copies added - anybody has an idea what is going on here and how to fix this? Oliver From: "presse(a)example.com" <presse(a)example.com> Content-Type: multipart/alternative; boundary="Apple-Mail=_451F3D0B-155E-46EF-9BFB-B8034A7E2AE1" Mime-Version: 1.0 (Mac OS X Mail 16.0 $3826.300.87.4.3$) Subject: Re: EXTERN: Re: Example Mail X-Universally-Unique-Identifier: 6CD82CDA-138B-412E-8D4D-74C8C82B72ED Date: Mon, 13 Jan 2025 11:17:09 +0100 References: <DB3PR05MB100724231A87B9AE130C0EE0C853A2(a)DB3PR05MB10072.eurprd05.prod.outlook.com> <DB3PR05MB100725A1F1367C304AC417A9585002(a)DB3PR05MB10072.eurprd05.prod.outlook.com> <DB3PR05MB1007220945CC70CDACDDBA5D685022(a)DB3PR05MB10072.eurprd05.prod.outlook.com> <DB3PR05MB100724A5040FA029A29E625D1850D2(a)DB3PR05MB10072.eurprd05.prod.outlook.com> <09B63703-8BC4-484F-905A-899BA9A72139(a)example.com> <DB3PR05MB10072F836F9FCE2F9F626392D85142(a)DB3PR05MB10072.eurprd05.prod.outlook.com> <BA8A1660-FC7D-4478-9F5F-E8B062B39115(a)example.com> <005d01db659c$cf2a48c0$6d7eda40$@John.Doe@t-online.de> To: John Doe <John.Doe(a)t-online.de> In-Reply-To: <005d01db659c$cf2a48c0$6d7eda40$@Jon.Doe@t-online.de> Message-Id: <A03E3B7A-638A-4482-83D8-C5B297D9953E(a)example.com> -- Protect your environment - close windows and adopt a penguin! Hi All, I have migrated my mailserver (from dovecot 2.2 on debian 10 to dovecot 2.3 provided by the mailcow-dockerized project) by coping over the mailstorage directory "as is". There is now a single mailbox where I have an issue with duplicated mails - the "Sent" folder had approx 400 mails upon migration, it now has 4500 mails with each mail duplicated several times. Below are the header lines of one message, besides the Message-Id the header is exactly the same on all copies. I tried "doveadm force-resync" on the mailbox and the mailbox was removed and recreated from scratch on the mail app but we still get additional copies added - anybody has an idea what is going on here and how to fix this? Oliver From: [1]"presse(a)example.com" [2]<presse(a)example.com> Content-Type: multipart/alternative; boundary="Apple-Mail=_451F3D0B-155E-46EF-9BFB-B8034A7E2AE1" Mime-Version: 1.0 (Mac OS X Mail 16.0 $3826.300.87.4.3$) Subject: Re: EXTERN: Re: Example Mail X-Universally-Unique-Identifier: 6CD82CDA-138B-412E-8D4D-74C8C82B72ED Date: Mon, 13 Jan 2025 11:17:09 +0100 References: [3]<DB3PR05MB100724231A87B9AE130C0EE0C853A2(a)DB3PR05MB10072.eurprd05.prod.outlook.com> [4]<DB3PR05MB100725A1F1367C304AC417A9585002(a)DB3PR05MB10072.eurprd05.prod.outlook.com> [5]<DB3PR05MB1007220945CC70CDACDDBA5D685022(a)DB3PR05MB10072.eurprd05.prod.outlook.com> [6]<DB3PR05MB100724A5040FA029A29E625D1850D2(a)DB3PR05MB10072.eurprd05.prod.outlook.com> [7]<09B63703-8BC4-484F-905A-899BA9A72139(a)example.com> [8]<DB3PR05MB10072F836F9FCE2F9F626392D85142(a)DB3PR05MB10072.eurprd05.prod.outlook.com> [9]<BA8A1660-FC7D-4478-9F5F-E8B062B39115(a)example.com> [10]<005d01db659c$cf2a48c0$6d7eda40$@John.Doe@t-online.de> To: John Doe [11]<John.Doe(a)t-online.de> In-Reply-To: [12]<005d01db659c$cf2a48c0$6d7eda40$@Jon.Doe@t-online.de> Message-Id: [13]<A03E3B7A-638A-4482-83D8-C5B297D9953E(a)example.com> -- Protect your environment - close windows and adopt a penguin! References Visible links 1. mailto:presse@example.com 2. mailto:presse@example.com 3. mailto:DB3PR05MB100724231A87B9AE130C0EE0C853A2@db3pr05mb10072.eurprd05.prod.outlook.com 4. mailto:DB3PR05MB100725A1F1367C304AC417A9585002@db3pr05mb10072.eurprd05.prod.outlook.com 5. mailto:DB3PR05MB1007220945CC70CDACDDBA5D685022@db3pr05mb10072.eurprd05.prod.outlook.com 6. mailto:DB3PR05MB100724A5040FA029A29E625D1850D2@db3pr05mb10072.eurprd05.prod.outlook.com 7. mailto:09B63703-8BC4-484F-905A-899BA9A72139@example.com 8. mailto:DB3PR05MB10072F836F9FCE2F9F626392D85142@db3pr05mb10072.eurprd05.prod.outlook.com 9. mailto:BA8A1660-FC7D-4478-9F5F-E8B062B39115@example.com 10. mailto:005d01db659c$cf2a48c0$6d7eda40$@John.Doe@t-online.de 11. mailto:John.Doe@t-online.de 12. mailto:005d01db659c$cf2a48c0$6d7eda40$@Jon.Doe@t-online.de 13. mailto:A03E3B7A-638A-4482-83D8-C5B297D9953E@example.com

3 4

doveadm sync across versions
by Joel Mawhorter 04 Oct '25

04 Oct '25

Greetings, How close in versions do dovecot installations need to be in order to use doveadm sync? Exact same version? Same major version? thanks, Joel

3 3

A question about Debian
by Jean-Paul POZZI 04 Oct '25

04 Oct '25

Hello, I want to install Dovecot CE on a new machine fitted with a Debian Trixie and there is no Dovecot repository for Trixie. Is a Trixie-friendly version planned for the near future? Regards JPP Hello, I want to install Dovecot CE on a new machine fitted with a Debian Trixie and there is no Dovecot repository for Trixie. Is a Trixie-friendly version planned for the near future? Regards JPP

1 0

help debugging a dsync panic
by Joel Mawhorter 04 Oct '25

04 Oct '25

Hello all, I'm trying to use deoveadm to sync from a dovecot server running version 2.3.21.1 to a version running 2.4.1. On the side initiating the "doveadm sync", I get the following error: dsync-remote(joel(a)zzzzz.org)<NRNIIBS132iEKgAAoT89Zw>: Panic: file dsync-mailbox-import.c: line 2188 (dsync_mailbox_import_handle_mail): assertion failed: (array_count(&wanted_uids) > 0) dsync-remote(joel(a)zzzzz.org)<NRNIIBS132iEKgAAoT89Zw>: Error: Raw backtrace: #1 [unw_get_proc_name() failed: -10] -> #2 default_fatal_handler[0xffffac4800a0] -> #3 i_panic[0xffffac3a3700] -> #4 [unw_get_proc_name() failed: -10] -> #5 dsync_mailbox_import_changes_finish[0xaaaadf53e804] -> #6 dsync_brain_sync_mails[0xaaaadf53ef4c] -> #7 [unw_get_proc_name() failed: -10] -> #8 [unw_get_proc_name() failed: -10] -> #9 [unw_get_proc_name() failed: -10] -> #10 io_loop_call_io[0xffffac4a1e30] -> #11 io_loop_handler_run_internal[0xffffac4a4420] -> #12 io_loop_handler_run[0xffffac4a4650] -> #13 io_loop_run[0xffffac4a4920] -> #14 [unw_get_proc_name() failed: -10] -> #15 [unw_get_proc_name() failed: -10] -> #16 doveadm_cmd_ver2_to_mail_cmd_wrapper[0xaaaadf518e90] -> #17 doveadm_cmdline_run[0xaaaadf52e824] -> #18 doveadm_cmdline_try_run[0xaaaadf52ef40] -> #19 main[0xaaaadf5051e0] -> #20 [unw_get_proc_name() failed: -10] -> #21 __libc_start_main[0xffffac0a22e0] dsync-local(joel(a)zzzzz.org)<RbkUCxO132hp0QAAVDKehA>: Error: read(mail2.zzzzz.org) failed: EOF (last sent=mail_request (EOL), last recv=mail_change (EOL)) dsync-local(joel(a)zzzzz.org)<RbkUCxO132hp0QAAVDKehA>: Error: Remote command returned error 255: ssh zz.zz.zz.zz doveadm dsync-server -ujoel(a)zzzzz.org Neither server has errors in the log corresponding to this error. Both servers are still running after this error. I'm looking for some help in how to debug this. The above error is entire and only changed to obfuscate domain names and IP addresses. Joel

2 1

IMAPSieve filters don't run on virtual mailboxes
by Ákos Szőts 03 Oct '25

03 Oct '25

Hi everyone, In the following configuration my IMAPSieve script doesn't run on the configured "copy" action when I assign it to a virtual mailbox. However, using the very same config snippet on a regular mailbox, the script suddenly starts to work. Move direction: from virtual to virtual (INBOX/Primary to INBOX/Notification). Do you know how to assign IMAPSieve to virtual mailboxes? Virtual config: namespace virtual-classification { prefix = "INBOX/" separator = / mail_driver = virtual mail_path = /var/lib/dovecot/virtual/classification/en mail_index_path = %{home}/index/virtual/classification/en namespace_subscriptions = no mailbox Notification { auto = subscribe sieve_script classification-move1 { type = before cause = copy append path = /var/lib/dovecot/sieve/imapsieve.d/classification-move.sieve } } mailbox Primary { [...] } } Sieve script: require ["vnd.dovecot.debug"]; debug_log "IMAPSIEVE SCRIPT WAS CALLED!"; Virtual file: virtual/classification/en/Notification/dovecot-virtual: !INBOX KEYWORD classification-notification The same result with "!INBOX" and "INBOX". Inbox namespace (working example): namespace inbox { separator = / inbox = yes mail_path = %{home}/mail mail_index_path = %{home}/index/inbox mailbox "Archive" { special_use = \Archive auto = subscribe sieve_script classification-move1 { type = before cause = copy append path = /var/lib/dovecot/sieve/imapsieve.d/classification-move.sieve } } } In the latter case the script is called properly and I see the debug message in info.log. But in the virtual case, the script doesn't run. Debug logs of failing case: Mailbox INBOX: Mailbox opened Mailbox INBOX/Primary: Mailbox opened Mailbox INBOX: Mailbox opened Namespace inbox: Using permissions from /var/spool/mail/[...]//mail: mode=0700 gid=default Mailbox INBOX: Mailbox opened Mailbox INBOX: imapsieve: MOVE event Mailbox INBOX: UID 2147: Expunge requested Mailbox INBOX/Primary: UID 47: Expunge requested dict(file): dict created (driver=file) dict(file): Looking up 'shared/90b3ed0066c4fe670a000000b7545530/imapsieve/script' dict(file): Lookup finished for 'shared/90b3ed0066c4fe670a000000b7545530/imapsieve/script': not found Mailbox INBOX: imapsieve: Mailbox attribute /shared/imapsieve/script not found dict(file): Looking up 'shared/90b3ed0066c4fe670a000000b7545530/vendor/vendor.dovecot/pvt/server/imapsieve/script' dict(file): Lookup finished for 'shared/90b3ed0066c4fe670a000000b7545530/vendor/vendor.dovecot/pvt/server/imapsieve/script': not found Mailbox INBOX: imapsieve: Server attribute /shared/imapsieve/script not found duplicate db: Initialize sieve: Pigeonhole version 2.4.1-4 (0a86619f) initializing Loading modules from directory: /usr/lib64/dovecot/modules/sieve Module loaded: /usr/lib64/dovecot/modules/sieve/lib90_sieve_extprograms_plugin.so Module loaded: /usr/lib64/dovecot/modules/sieve/lib90_sieve_imapsieve_plugin.so sieve: Sieve Extprograms plugin for Pigeonhole version 2.4.1-4 (0a86619f) loaded sieve: Sieve imapsieve plugin for Pigeonhole version 2.4.1-4 (0a86619f) loaded fts-flatcurve: fts-flatcurve(INBOX): Expunge uid=2147 fts-flatcurve: fts-flatcurve(INBOX): Opened DB (RO) messages=136 version=1 shards=2 fts-flatcurve: fts-flatcurve(INBOX): Opened DB (RW, current.1755771145431021) messages=48 version=1 Mailbox INBOX: UID 2147: Mail expunged fts-flatcurve: fts-flatcurve(INBOX): Committed 1 changes to DB (RW, current.1755771145431021) in 0.003 secs fts-flatcurve: fts-flatcurve: Update transaction completed in 0.004 secs Mailbox INBOX/Primary: Backend mailbox INBOX changed: UIDNEXT changed: 2277 -> 2278 IMAPSieve config seems to work (based on the successful regular mailbox example), so I don't paste the whole sieve config (but in case it's necessary, I'll do it). Ákos

2 1

Message duplication in Sent folder after upgrade
by Oliver Welter 03 Oct '25

03 Oct '25

Hi All, I have migrated my mailserver (from dovecot 2.2 on debian 10 to dovecot 2.3 provided by the mailcow-dockerized project) by coping over the mailstorage directory "as is". There is now a single mailbox where I have an issue with duplicated mails - the "Sent" folder had approx 400 mails upon migration, it now has 4500 mails with each mail duplicated several times. Below are the header lines of one message, besides the Message-Id the header is exactly the same on all copies. I tried "doveadm force-resync" on the mailbox and the mailbox was removed and recreated from scratch on the mail app but we still get additional copies added - anybody has an idea what is going on here and how to fix this? Oliver From: "presse(a)example.com" <presse(a)example.com> Content-Type: multipart/alternative; boundary="Apple-Mail=_451F3D0B-155E-46EF-9BFB-B8034A7E2AE1" Mime-Version: 1.0 (Mac OS X Mail 16.0 $3826.300.87.4.3$) Subject: Re: EXTERN: Re: Example Mail X-Universally-Unique-Identifier: 6CD82CDA-138B-412E-8D4D-74C8C82B72ED Date: Mon, 13 Jan 2025 11:17:09 +0100 References: <DB3PR05MB100724231A87B9AE130C0EE0C853A2(a)DB3PR05MB10072.eurprd05.prod.outlook.com> <DB3PR05MB100725A1F1367C304AC417A9585002(a)DB3PR05MB10072.eurprd05.prod.outlook.com> <DB3PR05MB1007220945CC70CDACDDBA5D685022(a)DB3PR05MB10072.eurprd05.prod.outlook.com> <DB3PR05MB100724A5040FA029A29E625D1850D2(a)DB3PR05MB10072.eurprd05.prod.outlook.com> <09B63703-8BC4-484F-905A-899BA9A72139(a)example.com> <DB3PR05MB10072F836F9FCE2F9F626392D85142(a)DB3PR05MB10072.eurprd05.prod.outlook.com> <BA8A1660-FC7D-4478-9F5F-E8B062B39115(a)example.com> <005d01db659c$cf2a48c0$6d7eda40$@John.Doe@t-online.de> To: John Doe <John.Doe(a)t-online.de> In-Reply-To: <005d01db659c$cf2a48c0$6d7eda40$@Jon.Doe@t-online.de> Message-Id: <A03E3B7A-638A-4482-83D8-C5B297D9953E(a)example.com> -- Protect your environment - close windows and adopt a penguin! Hi All, I have migrated my mailserver (from dovecot 2.2 on debian 10 to dovecot 2.3 provided by the mailcow-dockerized project) by coping over the mailstorage directory "as is". There is now a single mailbox where I have an issue with duplicated mails - the "Sent" folder had approx 400 mails upon migration, it now has 4500 mails with each mail duplicated several times. Below are the header lines of one message, besides the Message-Id the header is exactly the same on all copies. I tried "doveadm force-resync" on the mailbox and the mailbox was removed and recreated from scratch on the mail app but we still get additional copies added - anybody has an idea what is going on here and how to fix this? Oliver From: [1]"presse(a)example.com" [2]<presse(a)example.com> Content-Type: multipart/alternative; boundary="Apple-Mail=_451F3D0B-155E-46EF-9BFB-B8034A7E2AE1" Mime-Version: 1.0 (Mac OS X Mail 16.0 $3826.300.87.4.3$) Subject: Re: EXTERN: Re: Example Mail X-Universally-Unique-Identifier: 6CD82CDA-138B-412E-8D4D-74C8C82B72ED Date: Mon, 13 Jan 2025 11:17:09 +0100 References: [3]<DB3PR05MB100724231A87B9AE130C0EE0C853A2(a)DB3PR05MB10072.eurprd05.prod.outlook.com> [4]<DB3PR05MB100725A1F1367C304AC417A9585002(a)DB3PR05MB10072.eurprd05.prod.outlook.com> [5]<DB3PR05MB1007220945CC70CDACDDBA5D685022(a)DB3PR05MB10072.eurprd05.prod.outlook.com> [6]<DB3PR05MB100724A5040FA029A29E625D1850D2(a)DB3PR05MB10072.eurprd05.prod.outlook.com> [7]<09B63703-8BC4-484F-905A-899BA9A72139(a)example.com> [8]<DB3PR05MB10072F836F9FCE2F9F626392D85142(a)DB3PR05MB10072.eurprd05.prod.outlook.com> [9]<BA8A1660-FC7D-4478-9F5F-E8B062B39115(a)example.com> [10]<005d01db659c$cf2a48c0$6d7eda40$@John.Doe@t-online.de> To: John Doe [11]<John.Doe(a)t-online.de> In-Reply-To: [12]<005d01db659c$cf2a48c0$6d7eda40$@Jon.Doe@t-online.de> Message-Id: [13]<A03E3B7A-638A-4482-83D8-C5B297D9953E(a)example.com> -- Protect your environment - close windows and adopt a penguin! References Visible links 1. mailto:presse@example.com 2. mailto:presse@example.com 3. mailto:DB3PR05MB100724231A87B9AE130C0EE0C853A2@db3pr05mb10072.eurprd05.prod.outlook.com 4. mailto:DB3PR05MB100725A1F1367C304AC417A9585002@db3pr05mb10072.eurprd05.prod.outlook.com 5. mailto:DB3PR05MB1007220945CC70CDACDDBA5D685022@db3pr05mb10072.eurprd05.prod.outlook.com 6. mailto:DB3PR05MB100724A5040FA029A29E625D1850D2@db3pr05mb10072.eurprd05.prod.outlook.com 7. mailto:09B63703-8BC4-484F-905A-899BA9A72139@example.com 8. mailto:DB3PR05MB10072F836F9FCE2F9F626392D85142@db3pr05mb10072.eurprd05.prod.outlook.com 9. mailto:BA8A1660-FC7D-4478-9F5F-E8B062B39115@example.com 10. mailto:005d01db659c$cf2a48c0$6d7eda40$@John.Doe@t-online.de 11. mailto:John.Doe@t-online.de 12. mailto:005d01db659c$cf2a48c0$6d7eda40$@Jon.Doe@t-online.de 13. mailto:A03E3B7A-638A-4482-83D8-C5B297D9953E@example.com

1 0

Dovecot 2.3.21 Fallback MOVE to COPY on read-only namespaces
by Maciej Milaszewski 02 Oct '25

02 Oct '25

Hi I’m running Dovecot 2.3.21 with additional namespaces that point to read-only maildir snapshots. The setup works fine for browsing and copying messages, but when using Roundcube Webmail 1.5.3, there is a problem with the IMAP MOVE command. - If I try to move a message from a read-only namespace, Roundcube issues UID MOVE, which fails (as expected, since MOVE = COPY + DELETE, and DELETE is impossible). - What I would need is a way for Roundcube to fallback to COPY when the source/destination namespace is read-only ? I already tested: - `imap_move = false` in Roundcube config - Overriding capabilities in Dovecot (`imap_capability`) to remove MOVE, but this does not fully work. - Using INDEX=MEMORY / CONTROL outside snapshot for namespaces. What I’m looking for: - workaround in Dovecot to hide MOVE capability only for specific namespaces. - or Roundcube plugin or patch that intercepts MOVE and replaces it with COPY for read-only namespaces.

1 0

How to share ONE mailbox with a single user in, and configure auto ACL inheritance and Thunderbird SETACL support, in Dovecot 2.4.1?
by publists＠emailgroups.net 02 Oct '25

02 Oct '25

Hi, I’m working with Dovecot 2.4.1 and the acl plugin. I'm trying to get per-mailbox shared namespace+acl configured and working dynamically. One owner (owner(a)example.com) has a real Maildir folder "TEST_SHARE" at the top level cd /mail/path/example.com/owner/Maildir ls -1 cur/ dovecot-acl-list Drafts/ Junk/ new/ Queue/ Sent/ shared/ TEST_SHARE/ <------------------------ tmp/ Trash/ The goal is to share that TEST_SHARE/ folder with exactly one other user (user(a)example.com) not globally or using the global shared/ namespace. My current config includes It looks like in acl config you can hardwire access for a specific mailbox. Reading the 2.4 docs, using acl global file is deprecated and we're supposed to use acl config. namespace inbox { inbox = yes type = private prefix = separator = / hidden = no list = yes subscriptions = yes mailbox TEST_SHARE { acl owner { rights = lrwstipekxa } acl user=user(a)example.com { rights = lrwstipekx } } } namespace shared { type=shared; prefix=shared/$domain/$username/ } mail_plugin { acl = yes } acl_driver = vfile acl_sharing_map { dict file { path = /etc/dovecot/shared.db } } With that config "user" can see and use "owner’s" TEST_SHARE folder in Thunderbird client. But if "owner" changes the tree in their view, like creates a subfolder under TEST_SHARE in TBird, it does not appear for "user". No dovecot-acl file or acl_sharing_map entry is auto-created for the new subfolder. Reading the acl docs, I think that's because these ACLs are only STATIC configs that are merged with vfile ACLs at runtime? It looks to me like there's no automatic ACL inheritance from the parent to child mailboxes. And the acl.conf ACLs don't seem to cause dovecot-acl files or the acl_sharing_map db to be created or updated. I think "IMAP SETACL" would be needed on the client side. Reading https://support.mozilla.org/en-US/kb/imap-synchronization I can't figure out if Thunderbird does that or not. Can Dovecot server-side be configured to automatically create or update those shared acls/maps? I'm looking for any guidance how to do this, either in Thunderbird or Dovecot 2.4. So that any change to TEST_SHARE by either the owner or the authorized user is immediately pushed and sync'd between both owner and user. Dave

1 0

How to use redis as authentication database on dovecot 2.4.1
by 东山 02 Oct '25

02 Oct '25

How to use redis as authentication database on dovecot 2.4.1 Sir, dovecot is great, thanks. I want to use redis as authentication database on dovecot 2.4.1, but failed. Dict key-value database (Redis, memcached, etc.) is listed on v2.3, but was removed on 2.4.1. As https://doc.dovecot.org/2.4.1/core/config/auth/databases/lua.html , I was trying to auth via lua, like -- local redis = require('redis') -- on a lua file, but dovecot reported - module redis not found. I was trying to apt install dovecot-lua lua5.3 luarocks luaredis , but not work. Oct 02 11:02:54 debian dovecot[43745]: auth: Fatal: passdb-lua: script_init() failed: lua_pcall(/etc/dovecot/conf.d/auth_redis.lua) failed: /etc/dovecot/conf.d/auth_redis.lua:1: module 'redis' not found: Oct 02 11:02:54 debian dovecot[43745]: auth: Fatal: no field package.preload['redis'] Oct 02 11:02:54 debian dovecot[43745]: auth: Fatal: no file '/usr/local/share/lua/5.4/redis.lua' Oct 02 11:02:54 debian dovecot[43745]: auth: Fatal: no file '/usr/local/share/lua/5.4/redis/init.lua' Oct 02 11:02:54 debian dovecot[43745]: auth: Fatal: no file '/usr/local/lib/lua/5.4/redis.lua' Oct 02 11:02:54 debian dovecot[43745]: auth: Fatal: no file '/usr/local/lib/lua/5.4/redis/init.lua' Oct 02 11:02:54 debian dovecot[43745]: auth: Fatal: no file '/usr/share/lua/5.4/redis.lua' Oct 02 11:02:54 debian dovecot[43745]: auth: Fatal: no file '/usr/share/lua/5.4/redis/init.lua' Oct 02 11:02:54 debian dovecot[43745]: auth: Fatal: no file './redis.lua' Oct 02 11:02:54 debian dovecot[43745]: auth: Fatal: no file './redis/init.lua' Oct 02 11:02:54 debian dovecot[43745]: auth: Fatal: no file '/usr/local/lib/lua/5.4/redis.so' Oct 02 11:02:54 debian dovecot[43745]: auth: Fatal: no file '/usr/lib/x86_64-linux-gnu/lua/5.4/redis.so' Oct 02 11:02:54 debian dovecot[43745]: auth: Fatal: no file '/usr/lib/lua/5.4/redis.so' Oct 02 11:02:54 debian dovecot[43745]: auth: Fatal: no file '/usr/local/lib/lua/5.4/loadall.so' Oct 02 11:02:54 debian dovecot[43745]: auth: Fatal: no file './redis.so' Oct 02 11:02:54 debian dovecot[43745]: auth: Fatal: stack traceback: Oct 02 11:02:54 debian dovecot[43745]: auth: Fatal: [C]: in function 'require' Oct 02 11:02:54 debian dovecot[43745]: auth: Fatal: /etc/dovecot/conf.d/auth_redis.lua:1: in main chunk Oct 02 11:02:54 debian dovecot[43743]: master: Error: service(auth): command startup failed, throttling for 2.000 secs How to use redis as authentication database on dovecot 2.4.1? How to add redis.so to let dovecot's lua support redis connection? Thanks.

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