When DenyHosts sends email about hosts it has blocked, it would be nice to have a setting where optional information is included. Something for sure I'd like to see in the email is what rule they violated to get them banned.
Other possible useful information could be when the attempts were made from the IP address, and maybe what the attempts actually were. For those that use the purge feature, it would also be handy if the email could tell us how many times an IP has been banned.
I'm sure there's also plenty of other information that could be relevant.
This feature would be of great use for me too,
because sometimes reverse dns lookups do not work the option for a geoip lookup would be great.