For some reason your original email showed up only now. Can you post your 
doveconf from the *old* server as well as doveconf from *new* server, so it 
would make it lot easier to know why it's not working.

Aki

> On 04/12/2025 12:38 EET byteme--- via dovecot <[email protected]> wrote:
> 
>  
> Hello everyone,
> 
> I have a Dovecot 2.3 installation on a Debian 12 Linux system that is being 
> upgraded to Dovecot 2.4. The server hosts many domains with numerous email 
> accounts. Users had created folder structures containing many received and 
> sent emails, following the Maildir standard as "dot-prefixed folders."
> 
> When switching to Dovecot 2.4, all these emails and folders are no longer 
> visible. This is what it looks like on the old system:
> 
> root@mx1 /var/vmail/example.com/systemmails # ll -a
> insgesamt 256
> drwx------ 14 vmail vmail  4096  3. Nov 09:15 .
> drwx------ 15 vmail vmail  4096  6. Apr 2021  ..
> drwx------  5 vmail vmail  4096  3. Nov 09:15 .Archive
> drwx------  2 vmail vmail 86016 27. Okt 12:19 cur
> -rw-------  1 vmail vmail     0 15. Sep 2018  dovecot-acl-list
> -rw-------  1 vmail vmail  1080 29. Okt 06:50 dovecot.index
> -rw-------  1 vmail vmail 23400 30. Okt 01:36 dovecot.index.cache
> -rw-------  1 vmail vmail 10600 30. Okt 01:41 dovecot.index.log
> -rw-------  1 vmail vmail  6627 26. Aug 09:56 dovecot.index.thread
> -rw-------  1 vmail vmail    24 20. Apr 2024  dovecot-keywords
> -rw-------  1 vmail vmail  1256  3. Nov 09:05 dovecot.list.index
> -rw-------  1 vmail vmail  5156  3. Nov 09:15 dovecot.list.index.log
> -rw-------  1 vmail vmail   672 15. Jul 16:45 dovecot.mailbox.log
> -rw-------  1 vmail vmail  1781 30. Okt 01:36 dovecot-uidlist
> -rw-------  1 vmail vmail     8 15. Jul 16:45 dovecot-uidvalidity
> -r--r--r--  1 vmail  1002     0 15. Sep 2018  dovecot-uidvalidity.5b9d20a3
> -r--r--r--  1 vmail vmail     0 15. Sep 2018  dovecot-uidvalidity.5b9d20a5
> drwx------  5 vmail vmail  4096  3. Nov 09:15 .Drafts
> drwx------  5 vmail vmail  4096  3. Nov 09:15 .INBOX.Fail2ban
> drwx------  5 vmail vmail  4096  3. Nov 09:15 .INBOX.vzdump
> drwx------  5 vmail vmail  4096  3. Nov 09:15 .Junk
> drwx------  2 vmail vmail 36864 30. Okt 01:36 new
> drwx------  5 vmail vmail  4096  3. Nov 09:15 .Quarantine
> drwx------  5 vmail vmail  4096  3. Nov 09:15 .Sent
> drwx------  3 vmail vmail  4096  3. Dez 06:25 sieve
> -rw-------  1 vmail vmail    70 15. Jul 16:45 subscriptions
> drwx------  2 vmail vmail  4096  2. Nov 16:41 tmp
> drwx------  5 vmail vmail  4096  3. Nov 09:15 .Trash
> 
> This should be preserved so that users don't notice the system upgrade. 
> Dovecot 2.4 works quite differently in this regard. What solution is there 
> for migrating both the namespace and the existing emails to Dovecot 2.4?
> 
> Thank you for your suggestions
> 
> ByteMe
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