spamcalc is a script to calculate the so-called 'dns pollution' value of a hostname, and has nothing to do with email spam.
some channels on IRC actually have their bots setting automatic bans based on this script.
like in this case (real log *g*)
SheepCow [firstname.lastname@example.org] has joined #linux mode/#linux [+b *!*@cheese.is.tasty.and.it.0wns.me.uk] by dedz0ne SheepCow was kicked from #linux by dedz0ne [banned: Lame vhost - see http://spamcalc.net]