> On 05/09/2025 04:46 EEST Zhang Huangbin via dovecot <[email protected]> 
> wrote:
> 
>  
> Dear all,
> 
> I'm configuring Dovecot 2.4.1 with per-user mailbox format support, but
> cannot get user shared mailbox working between different mailbox formats.
> 
> - Account [email protected] is a mdbox format mailbox, access with webmail is 
> ok.
> - Account [email protected] is a maildir format mailbox, access with webmail 
> is ok.
> - mdbox@ shares its Sent folder to maildir@ with Roundcube webmail,
>   grants all privileges (`akxeilprwts`).
> 
> The result is maildir@ cannot see the shared folder.
> 
> - No error reported in Dovecot log file.
> - mysql logs the queries performed to get user shared mailbox, i ran the
>   query manually and it returns correct result like this:
> 
> ```
> MariaDB [vmail]> SELECT dummy,from_user FROM share_folder WHERE to_user = 
> '[email protected]' \G
> *************************** 1. row ***************************
>     dummy: 1
> from_user: [email protected]
> ```
> 
> dovecot.conf snippet attached below. I think the "mail_*" parameters inside
> `namespace shared {}` block are incorrect to handle mixed
> mailbox formats because it hard-codes the mail_driver and mail_path, tried all
> possible parameters i can imagine, but failed.
> 
> Thanks for helping. :)
> 

Running mixed system with shared folders is going to indeed be very difficult 
and I would strongly recommend against it. It sounds to me that you should 
migrate to new server with new config and just one mailbox format first.

Aki

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