September 2023 - dovecot

bug report: lmtp fails on root-squashed NFS filesystem
by Anne Bennett 09 Oct '23

09 Oct '23

Hi, all. I'm trying to set up Postfix with dovecot LTMP delivery on a host where the user files (/var/spool/mail as well as home directories) are on NFS filesystems, which are exported root-squashed to the mail server. I definitely don't want to give the mail server root permissions on the user files. LMTP delivery fails with this logged message (e.g.): Nov 16 17:51:36 lust dovecot: lmtp(anne)<16830><mkkzEPg1lGG+QQAAs/mAJw>: msgid=<202111162229.1AGMTfAO024765(a)vindemiatrix.encs.concordia.ca>: save failed to INBOX: Read-only mbox I found this posting where someone else had a similar problem and traced it in some detail back in 2019: https://dovecot.org/list/dovecot/2019-February/114611.html but apparently no one answered the fellow. In order to check that this is indeed the same problem, I temporarily changed the INBOX definition to make it write into /var/tmp/ (on a local filesystem), and delivery worked. I then temporarily changed the INBOX definition to make it write into an NFS filesystem with root NOT squashed, and again it worked (after I chmodded the directory to 1777 to allow any user to create a file). I believe that the person who wrote the above posting is correct: at some point, file access is (incorrectly) checked as root instead of as the target user. This is a bit of a showstopper for me. Any plans to address this? I attach the output of "dovecot -n", fwiw, but I don't think that this is a configuration problem... Anne. -- Ms. Anne Bennett, Senior Sysadmin, ENCS, Concordia University, Montreal H3G 1M8 anne(a)encs.concordia.ca +1 514 848-2424 x2285

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Compression: all or nothing?
by Alex King 02 Oct '23

02 Oct '23

Using 2.3.13 (89f716dc2) (debian package), with mdbox storage. I considering adding the zlib plugin. I understand that reading mail can cope with either compressed or uncompressed mailboxes. I'm wondering if I can leave the main storage uncompressed, while having the alternate storage compressed. There does not seem to be a way to configure this, from https://doc.dovecot.org/settings/plugin/zlib-plugin/ it seems compression (on saving emails) is an all-or-nothing option? Can I leave zlib_save unset in my main configuration, and have doveadm use some alternate configuration with zlib_save set? It doesn't look hopeful because I don't see the ability to use a different config at https://wiki.dovecot.org/Tools/Doveadm/Altmove. Perhaps I would need multiple copies of the daemon running? Or is it better just to compress everything? I plan to store older mails (perhaps 3months+) in the alternative storage, and was thinking it would be nice to have those compressed, while I don't need to compress the main store. Any feedback welcome. Thanks, Alex

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Separators and shared namespaces
by Francis Augusto Medeiros-Logeay 28 Sep '23

28 Sep '23

Hi Martin, I had a similar problem: https://dovecot.org/mailman3/archives/list/dovecot@dovecot.org/thread/DNHM3… It seemed to me that using ‘.’ truncated the domain name when that was used in the paths, such as when using %d. Best, Francis

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How to use http api doveadm to manage acl permissions
by cyril.leclerc＠mantiq.com 28 Sep '23

28 Sep '23

I started the http api on dovecot configuration but following the documentation available here : https://doc.dovecot.org/admin_manual/doveadm_http_api/ I dont see anything regarding the acl permissions ? do we have to use a specific command ? how to manage a user acl permissions ( change the content of dovecot-acl file ?

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Re: Dovecot lda-dupes
by Francis Augusto Medeiros-Logeay 28 Sep '23

28 Sep '23

Hi, I have read elsewhere that the Maildir shouldn’t be at the home. But that’s how it worked for me since the start. I wonder if I could either change the location of these .dovecot.lda-dupes, or if I could change home without having to move the mailboxes of all the users. Today I have this: On my dovecot-sql.conf.ext: iterate_query = SELECT username AS user FROM mailbox user_query = SELECT CONCAT('/var/mail/vmail/',maildir) AS home, \ CONCAT('maildir:/var/mail/vmail/',maildir,':INDEX=/var/vmail-index/index/%d/%n:CONTROL=/var/vmail-index/control/%d/%n') AS mail, \ 5000 AS uid, 5000 AS gid, CONCAT('*:bytes=',quota) AS quota_rule \ FROM mailbox WHERE username = '%u' AND active = 1 password_query = SELECT username AS user,password FROM mailbox \ WHERE username = '%u' AND active=‘1' On my 10-mail.conf mail_location = maildir:/var/mail/vmail/%d/%n:INDEX=/var/vmail-index/index/%d/%n:CONTROL=/var/vmail-index/control/%d/%n If I add `Maildir` to the mail_location and to the mail user_query, will I have to move mailboxes, or the only thing I have to do is to add “Maildir” when I use %h/%%h? Best, Francis

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Re: Dovecot lda-dupes
by Francis Augusto Medeiros-Logeay 28 Sep '23

28 Sep '23

Never mind, I found it. I had to add `replication_dsync_parameters`, with the default values, but with `-x shared` to exclude the namespace. Best, Francis

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Dovecot lda-dupes
by Francis Augusto Medeiros-Logeay 27 Sep '23

27 Sep '23

Hi, Since I enabled shared mailboxes I'm having these errors: Sep 27 21:22:41 doveadm(francis(a)med-lo.eu): Error: Failed to access mailbox dovecot/lda-dupes: stat(/var/mail/vmail/med-lo.eu/francis/.dovecot.lda-dupes/tmp) failed: Not a directory And replication stopped. How can I fix this? Best, Francis

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Separators and shared namespaces
by martin f krafft 27 Sep '23

27 Sep '23

Hello, I am running Dovcecot 2.3.19 on Debian, and I am trying to get shared to work. It's working if I do this: ``` namespace { type = shared separator = / prefix = Team/%%u/ location = maildir:%%h/Maildir:INDEX=%h/Maildir/Team/%%u:INDEXPVT=%h/Maildir/Team/%%u subscriptions = no list = children } ``` After setting some ACLs, I now have the following in `LIST` output: ``` … . LIST "" * * LIST (\HasNoChildren) "/" INBOX […] * LIST (\Noselect \HasChildren) "/" Team/rechnungseingang(a)example.org * LIST (\HasNoChildren) "/" "Team/rechnungseingang(a)example.org/Archiv bearbeitete Rechnungen" . OK List completed (0.003 + 0.000 + 0.007 secs). ``` However, since I am using Maildir, the default separator is `.`, and so I have to change the separator for the `inbox` namespace, which makes me feel uneasy. The system still uses `.dotted.notation` on the filesystem despite the namespace change, and subfolders and all still work, but it still rubs me the wrong way to do this. And yet, when I try to use `.` like this: ``` separator = . prefix = Team.%%u. location = maildir:%%h/Maildir:INDEX=%h/Maildir/.Team,%%u:INDEXPVT=%h/Maildir/.Team.%%u ``` then nothing shows up in `LIST` output. Any idea why this might be? Thanks, -- martin krafft | https://matrix.to/#/#madduck:madduck.net "den stil verbessern, das heißt den gedanken verbessern." - friedrich nietzsche {: .blockquote } spamtraps: madduck.bogus(a)madduck.net {: .hidden }

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Re: Separators and shared namespaces
by Francis Augusto Medeiros-Logeay 27 Sep '23

27 Sep '23

Hi, When I used a ‘.’ as a separator, it seemed to truncate paths with the domain name, such as those with %%d. That happened only to shared namespaces. Best, Francis

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Exclude shared mailboxes from replication
by Francis Augusto Medeiros-Logeay 27 Sep '23

27 Sep '23

Hi, I was wondering if it is possible to exclude shared mailboxes from replication. I have userb(a)mydomain.com sharing mailboxes to usera(a)mydomain.com. However, since both mailboxes already replicate to a backup server, I wonder if it is possible to exclude the replicated mailboxes from syncing. Best, Francis

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