It works for me. Could you please show us your /etc/fail2ban/jail.local? also, please double check whether the existence of the log files and filter files used in jail.local.
Feb 13 22:12:54 u14 fail2ban.server : INFO Changed logging target to SYSLOG for Fail2ban v0.8.11
Feb 13 22:12:54 u14 fail2ban.jail : INFO Creating new jail 'sshd'
Feb 13 22:12:54 u14 fail2ban.jail : INFO Jail 'sshd' uses pyinotify
Feb 13 22:12:54 u14 fail2ban.jail : INFO Initiated 'pyinotify' backend
Feb 13 22:12:54 u14 fail2ban.filter : INFO Added logfile = /var/log/auth.log
Feb 13 22:12:54 u14 fail2ban.filter : INFO Set maxRetry = 5
Feb 13 22:12:54 u14 fail2ban.filter : INFO Set findtime = 3600
Feb 13 22:12:54 u14 fail2ban.actions: INFO Set banTime = 86400
Feb 13 22:12:54 u14 fail2ban.jail : INFO Creating new jail 'sshd-ddos'
Feb 13 22:12:54 u14 fail2ban.jail : INFO Jail 'sshd-ddos' uses pyinotify
Feb 13 22:12:54 u14 fail2ban.jail : INFO Initiated 'pyinotify' backend
Feb 13 22:12:54 u14 fail2ban.filter : INFO Added logfile = /var/log/auth.log
Feb 13 22:12:54 u14 fail2ban.filter : INFO Set maxRetry = 5
Feb 13 22:12:54 u14 fail2ban.filter : INFO Set findtime = 3600
Feb 13 22:12:54 u14 fail2ban.actions: INFO Set banTime = 86400
Feb 13 22:12:54 u14 fail2ban.jail : INFO Creating new jail 'roundcube-iredmail'
Feb 13 22:12:54 u14 fail2ban.jail : INFO Jail 'roundcube-iredmail' uses pyinotify
Feb 13 22:12:54 u14 fail2ban.jail : INFO Initiated 'pyinotify' backend
Feb 13 22:12:54 u14 fail2ban.filter : INFO Added logfile = /var/log/mail.log
Feb 13 22:12:54 u14 fail2ban.filter : INFO Set maxRetry = 5
Feb 13 22:12:54 u14 fail2ban.filter : INFO Set findtime = 3600
Feb 13 22:12:54 u14 fail2ban.actions: INFO Set banTime = 86400
Feb 13 22:12:54 u14 fail2ban.jail : INFO Creating new jail 'dovecot-iredmail'
Feb 13 22:12:54 u14 fail2ban.jail : INFO Jail 'dovecot-iredmail' uses pyinotify
Feb 13 22:12:54 u14 fail2ban.jail : INFO Initiated 'pyinotify' backend
Feb 13 22:12:54 u14 fail2ban.filter : INFO Added logfile = /var/log/dovecot.log
Feb 13 22:12:54 u14 fail2ban.filter : INFO Set maxRetry = 5
Feb 13 22:12:54 u14 fail2ban.filter : INFO Set findtime = 3600
Feb 13 22:12:54 u14 fail2ban.actions: INFO Set banTime = 86400
Feb 13 22:12:54 u14 fail2ban.jail : INFO Creating new jail 'postfix-iredmail'
Feb 13 22:12:54 u14 fail2ban.jail : INFO Jail 'postfix-iredmail' uses pyinotify
Feb 13 22:12:54 u14 fail2ban.jail : INFO Initiated 'pyinotify' backend
Feb 13 22:12:54 u14 fail2ban.filter : INFO Added logfile = /var/log/mail.log
Feb 13 22:12:54 u14 fail2ban.filter : INFO Set maxRetry = 5
Feb 13 22:12:54 u14 fail2ban.filter : INFO Set findtime = 3600
Feb 13 22:12:54 u14 fail2ban.actions: INFO Set banTime = 86400
Feb 13 22:12:54 u14 fail2ban.jail : INFO Jail 'sshd' started
Feb 13 22:12:54 u14 fail2ban.jail : INFO Jail 'sshd-ddos' started
Feb 13 22:12:54 u14 fail2ban.jail : INFO Jail 'roundcube-iredmail' started
Feb 13 22:12:54 u14 fail2ban.jail : INFO Jail 'dovecot-iredmail' started
Feb 13 22:12:54 u14 fail2ban.jail : INFO Jail 'postfix-iredmail' started