Hadmut Danisch: > Is there a way to make postfix tell in the logs whether someone > authenticated on port 25 or 587?
Yes. Configure master.cf thusly: master.cf: smtp inet ... ... ... ... ... smtpd submission inet ... ... ... ... ... smtpd -o syslog_name=postfix/submission ... smtps inet ... ... ... ... ... smtpd -o syslog_name=postfix/smtps ... And look at the 'name' field in logging: postfix/smtpd[xxx]: disconnect from unknown[yyy] ... auth=... postfix/submission/smtpd[xxx]: disconnect from unknown[yyy] ... auth=... postfix/smtps/smtpd[xxx]: disconnect from unknown[yyy] ... auth=... The syslog_name settings were introduced with Postfix 2.10. Wietse