The "wikidown" address just got spammed. Since there's no way to get off of spammers' lists once on, that pretty much demands that we change it. Further, whatever means we are using to announce that address to human beings should probably be fixed to make it less friendly to address-sucking bots.
What about spamassassin? It's a pretty decent filter that should catch most of the spam. Getting and staying off spammers' lists seems like a futile exercise, and many people have now memorized the wikidown address.
Regard,
Erik