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fail2ban_sendername and fail2ban_sender not taken into account when using sendmail as MTA
I am using the sendmail command (via SSMTP) as MTA. I made sure to configure sendmail/SSMTP in such a way that the FROM address is overwriteable by the service using the MTA (e.g. by fail2ban).
my fail2ban action is %(action_mwl)s
This will result in the action at /etc/fail2ban/actions.d/sendmail-common.conf to be executed.
I observe that fail2ban_sendername and fail2ban_sender are not taken into account. Replacing /etc/fail2ban/actions.d/sendmail-common.conf with a correctly configured /etc/fail2ban/actions.d/sendmail-common.local will resolve the problem.
Is this an error in the role or in fail2ban itself?
Afaics this is an issue with the action configuration in jail.local which does not set the sender / sendername: https://github.com/fail2ban/fail2ban/issues/2071#issuecomment-371796715
