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[dovecot-pop3imap]
enabled = true
filter = dovecot-pop3imap
action = iptables-multiport[name=dovecot-pop3imap, port="pop3,pop3s,imap,imaps", protocol=tcp]
# optionaly mail notification # mail[name=dovecot-pop3imap, dest=root@domain] # see /etc/fail2ban/action.d/ or Fail2Ban doc