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I recently upgraded to Debian 8 on my mail server and I started getting my nagios server banned by fail2ban. The issue is that the following error appears in the mail.log when check_ssmt runs:
Mar 28 11:04:40 example postfix/smtpd[9460]: connect from 4-3-2-1.example.com[1.2.3.4]
Mar 28 11:04:40 example postfix/smtpd[9460]: improper command pipelining after QUIT from 4-3-2-1.example.com[1.2.3.4]:
Mar 28 11:04:40 example postfix/smtpd[9460]: disconnect from 4-3-2-1.example.com[1.2.3.4]
As there is a Github issue opened for this, I will be closing this thread - we try to keep conversations from being duplicated in two different places.