Thank you to all for the responses. Since this could eventually become a more serious issue some additional analysis on the log was completed identifying 21 distinct originating IP addresses from the countries listed below. UFW rules were added to block these IP addresses and the authentication failures have stopped.
Korea (the Republic of) [KR] China [CN] United States of America [US] India [IN] Germany [DE] Cameroon [CM] Singapore [SG] Brazil [BR] Russian Federation [RU] Singapore [SG] China [CN] -Bryan _______________________________________________ dovecot mailing list -- [email protected] To unsubscribe send an email to [email protected]
