Sender may not work anymore, depending on your system and installed mail or mailx.
Check your jail.conf for
Code:
# email action. Since 0.8.1 upstream fail2ban uses sendmail
# MTA for the mailing. Change mta configuration parameter to mail
# if you want to revert to conventional 'mail'.
#mta = sendmail
mta = mail
In the jail.conf of fail2ban version 0.8.3 this option doesn't seem to exist. I tried to add the proposed commands under [Default] but neither of them: mta = sendmail or mta = mail resolved the the error.
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