Thanks! I took those filters from the Docker Mailserver Examples - having commented those lines out of my config seems to have helps, but still have issues...
2025-04-21T14:41:20.451748+02:00 mail dovecot: auth: ldap(xxx@recognition-circular.org,89.241.29.42,
): unknown user (SHA1 of given password: 172710)
2025-04-21T14:41:22.499605+02:00 mail dovecot: imap-login: Disconnected: Aborted login by logging out (auth failed, 1 attempts in 2 secs): user=
, method=PLAIN, rip=89.241.29.42, lip=172.21.0.2, TLS, session=