Here is a snippet from our maillog file. Every time I try and authenticate via the admin panel it creates 6 records in the log with the info below. No idea where this mail authorization database resides. And no idea why this works for a day and then all of a sudden stops working. (btw - I changed the email address belowso I dont get spammed.) rip=51.22.182.23, lip=51.22.182.23, TLS, session=<YjHb2SRElMsyFbYX>Dec 21 00 www dovecot_authdb_plesk: No such user 'private@example.com' in mail authorization databaseDec 21 00 www dovecot_authdb_plesk: No such user 'private@example.com' in mail authorization databaseDec 21 00 www dovecot_authdb_plesk: No such user 'private@example.com' in mail authorization databaseDec 21 00 www dovecot_authdb_plesk: No such user 'private@example.com' in mail authorization databaseDec 21 00 www dovecot_authdb_plesk: No such user 'private@example.com' in mail authorization databaseDec 21 00 www dovecot_authdb_plesk: No such user 'private@example.com' in mail authorization databaseDec 21 00 www dovecot: imap-login: Aborted login (auth failed, 6 attempts in 39 secs): user=<private@example.com>, method=PLAIN, rip=51.22.182.23, lip=51.22.182.23, TLS, session=<fJ8U3SREmMsyFbYX>Dec 21 00 www dovecot_authdb_plesk: No such user 'private@example.com' in mail authorization databaseDec 21 00 www dovecot_authdb_plesk: No such user 'private@example.com' in mail authorization databaseDec 21 00 www dovecot_authdb_plesk: No such user 'private@example.com' in mail authorization databaseDec 21 00 www dovecot_authdb_plesk: No such user 'private@example.com' in mail authorization databaseDec 21 00 www dovecot_authdb_plesk: No such user 'private@example.com' in mail authorization databaseDec 21 00 www dovecot_authdb_plesk: No such user 'private@example.com' in mail authorization databaseDec 21 00 www dovecot: imap-login: Aborted login (auth failed, 6 attempts in 54 secs): user=<private@example.com>, method=PLAIN, rip=51.22.182.23, lip=51.22.182.23, TLS, session=<lJN36iREussyFbYX>Dec 21 00 www dovecot_authdb_plesk: No such user 'private@example.com' in mail authorization databaseDec 21 00 www dovecot_authdb_plesk: No such user 'private@example.com' in mail authorization databaseDec 21 00 www dovecot_authdb_plesk: No such user 'private@example.com' in mail authorization databaseDec 21 00 www dovecot_authdb_plesk: No such user 'private@example.com' in mail authorization databaseDec 21 00 www dovecot_authdb_plesk: No such user 'private@example.com' in mail authorization databaseDec 21 00 www dovecot_authdb_plesk: No such user 'private@example.com' in mail authorization databaseDec 21 00 www dovecot: imap-login: Aborted login (auth failed, 6 attempts in 39 secs): user=<private@example.com>, method=PLAIN, rip=51.22.182.23, lip=51.22.182.23, TLS, session=<4cv17iREwMsyFbYX>