Work continues on the graylist program [1]. I'm working on the Postfix [2] interface for my own domain, and Smirk just mentioned a domain we can use to test the Sendmail [3] interface. Smirk's domain is perfect for testing because
So the domain in question gets nothing but 100% spam (and a lot of it, according to Smirk)—perfect for testing the filtering capability of a graylist.