" ... The URLs are then compiled into a list which is verified for accuracy against the spam received..."
Especially since they indicate they "verify" the accuracy. If that is the case how did snopes.com get on the list? Plus all the real opt-in newsletters that clearly have "real" unsubscribe links on them.
That's because "verify" isn't "verify that the people that own the domain allowed spam to be sent out" (which would be extremely difficult to prove); it is "verify that the domain appeared in a spam."
FWIW, www.dnsstuff.com appeared in the IMail v8 anti-spam URL blacklist at one point, too. That URL did appear in at least one spam run, as a hidden link designed to help bypass spam control. Needless to say, the domain was simply an innocent victim.
This is one of the main drawbacks of URL-based spam databases -- it is extremely difficult to verify them well. Even if you have 100,000 spams with a URL in it, that doesn't mean that the URL is associated with the spammer.
-Scott
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