I haven't really found any way to do this - I have seen a few issues on the github dealing with it but nothing in the wiki indicating it exists.
Right now I have a problem, a set of 3 IP addresses are clobbering my SSHD. It's secure, no big deal - but I'm waking up to 10-15 email from fail2ban from these jerks. I've sent emails to their abuse line to no avail - the ISP seems to support this behavior?
What I have tried is adding the IP address to ufw with
DENY ALL. Since the IP address still shows up in my logs even though they are banned fail2ban still go nuts.
Is there a way to have an exponentially increasing ban time so I don't have to get my inbox blown up?