Different userdb per inet_listener

[Miloslav Hůla]

Hello,

we are running Dovecot (2.3.4.1-5+deb10u6) with PostgreSQL passdb and 
userdb and for remote Postfix:

auth_mechanisms = plain login
inet_listener {
  address = 127.0.0.1
  port = 12345
}

It works perfectly.


Now we would like to disable authentication for Postfix (SMTP), but 
allow it for Dovecot (IMAP & POP3). Something like "receive-only".

Is there any way we can configure different passdb for mentioned 
inet_listener?

Or is there any variable with "auth requetor name" we can use in SQL 
query to differentiate the result?

Regards
Miloslav