imap-login not passing DSN through

Hi,


I have a problem with postfix + dovecot 1:2.3.21+dfsg1-2ubuntu6.3  on 
Ubuntu Server 24.04:


When using dovecot's imap-login to verify users and passwords againgst 
dovecot's user list, it doesn't pass the DSN flag through, therefore  
effectively disabling DSN.


Postfix, submission port bound to 127.0.0.1, port 587:

250-myhostname
250-PIPELINING
250-SIZE 18432000
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-DSN
250-SMTPUTF8
250 CHUNKING


but imap-login (configured to forward to 127.0.0.1:587):

250-myhostname
250-8BITMIME
250-AUTH PLAIN
250-BURL imap
250-CHUNKING
250-ENHANCEDSTATUSCODES
250-SIZE
250 PIPELINING


So both the size limit and DSN are not passed through, SMTPUTF8 either.

Even setting

imap_capability = +DSN

in 20-imap.conf doesn't help.


What is keeping dovecot's imap-login from offering DSN?


best regards

Hadmut

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