Oh-- At 5106R, Location dovecot-log path has been changed while do not know. >From /var/log/secure to /var/log/maillog, it's to be the same as the 5108R and 5107R, I think. Let us change the logpath value in the /etc/fail2ban/jail.conf. [dovecot] ,,, logpath = /var/log/maillog ,,, Eiji Hamano