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My Dovecot mail server and Postfix MTA seems to be generating logs about attempts to login from localhost. How could I investigate this issue?

Log excerpt:

Jun  8 09:36:31 mailserver postfix/smtpd[16098]: connect from localhost[127.0.0.1]
Jun  8 09:36:31 mailserver postfix/smtpd[16098]: disconnect from localhost[127.0.0.1]
Jun  8 09:37:28 mailserver dovecot: imap-login: Aborted login (no auth attempts): rip=127.0.0.1, lip=127.0.0.1, secured
Jun  8 09:37:30 mailserver dovecot: pop3-login: Aborted login (no auth attempts): rip=127.0.0.1, lip=127.0.0.1, secured
Jun  8 09:37:31 mailserver postfix/smtpd[16098]: connect from localhost[127.0.0.1]
Jun  8 09:37:31 mailserver postfix/smtpd[16098]: disconnect from localhost[127.0.0.1]
Jun  8 09:38:28 mailserver dovecot: imap-login: Aborted login (no auth attempts): rip=127.0.0.1, lip=127.0.0.1, secured
Jun  8 09:38:30 mailserver dovecot: pop3-login: Aborted login (no auth attempts): rip=127.0.0.1, lip=127.0.0.1, secured
Jun  8 09:38:31 mailserver postfix/smtpd[16098]: connect from localhost[127.0.0.1]
Jun  8 09:38:31 mailserver postfix/smtpd[16098]: disconnect from localhost[127.0.0.1]
Jun  8 09:39:28 mailserver dovecot: imap-login: Aborted login (no auth attempts): rip=127.0.0.1, lip=127.0.0.1, secured
Jun  8 09:39:30 mailserver dovecot: pop3-login: Aborted login (no auth attempts): rip=127.0.0.1, lip=127.0.0.1, secured
Jun  8 09:39:31 mailserver postfix/smtpd[16098]: connect from localhost[127.0.0.1]
Jun  8 09:39:31 mailserver postfix/smtpd[16098]: disconnect from localhost[127.0.0.1]
Jun  8 09:40:28 mailserver dovecot: imap-login: Aborted login (no auth attempts): rip=127.0.0.1, lip=127.0.0.1, secured
Jun  8 09:40:30 mailserver dovecot: pop3-login: Aborted login (no auth attempts): rip=127.0.0.1, lip=127.0.0.1, secured
Jun  8 09:40:31 mailserver postfix/smtpd[16098]: connect from localhost[127.0.0.1]
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Do you have any kind of on-host monitoring system that checks the listeners on those ports? –  MadHatter Jun 8 '13 at 11:18

1 Answer 1

It seems that Zabbix was monitoring these services every minute and hence generating lots of log material.

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