Mail IP banned by fail2ban.

mail_banned_ip.sh

#! /bin/sh

servername="Server"

for ip in echo `grep -i unban /var/log/fail2ban.log | awk '{print $NF}' | tail -n 10`
do
    for email in `whois $ip | perl -wne'while(/[\w\.\-]+@[\w\.\-]+\w+/g){print "$&\n"}' | sort | uniq`
    do
        echo "Sending email to $email..."
        echo "Hi,

        The IP $ip has just been banned by Fail2Ban.
        Here are more information about $ip:

            `whois $ip`

        Regards," | mail -s "$servername banned $ip" $email;
    done
done