> On Sep 5, 2025, at 14:54, Aki Tuomi via dovecot <dovecot@dovecot.org> wrote:
>
> You can try to make it work *but* it requires that everyone has the *same*
> root folder for mails (mail_path). If you use something like mdbox/ and
> maildir/, it's not going to be possible to make it work. So use something
> like `mail/`.
We store mailbox format and folder name in SQL like below:
```
MariaDB [vmail]> select username,mailboxformat,mailboxfolder from mailbox \G
*************************** 1. row ***************************
username: mail...@a.io
mailboxformat: maildir
mailboxfolder: Maildir
*************************** 2. row ***************************
username: md...@a.io
mailboxformat: mdbox
mailboxfolder: mdbox
```
I also updated userdb to query and return them, then use them in
`namespace shared {}` like `%{userdb:mailboxformat}`, `%{userdb:mailboxfolder}`,
doesn't work either.
> Once everyone has same mail root folder, you can try to use mail_driver=auto
> in namespace shared. Don't use this for namespace inbox, because it will
> behave unexpectedly (for you) if the mailbox does not exist.
>
> You will run into exact same issues with 2.3 and 2.4. The problem is that the
> shared namespace cannot know what the target user is using for mail path if
> you don't use the same path.
Doc mentions variables like `%{owner_home}`, `%{owner_user}`, will it
work perfectly if Dovecot exports owner's `mail_driver` and `mail_path`
with variables like `%{owner_mail_driver}`, `%{owner_mail_path}`?
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