Sometimes several times a day I get logs like these:
May 31 14:07:01 hostname dovecot[89171]: pop3-login: Disconnected: Inactivity: rip=127.0.0.1, lip=127.0.0.1, secured
May 31 14:08:01 hostname dovecot[89171]: pop3-login: Disconnected: Inactivity: rip=127.0.0.1, lip=127.0.0.1, secured
on one...