I have fail2ban running but have no email sending configured. I only want this setup temporarily to see if I am getting any attacks. is there a way to add an email address via command line if necessary - I have postfix set up already.
Not directly, but you can temporarily set or unset the various “action*” for a particular jail to one of the sendmail-* options in /etc/fail2ban/ation.d/ with
fail2ban-client set <jail> action* <ACT> <CMD>
syntax and more at:-
Thanks Dicko, I’ll look into that.