Comment by TeMPOraL

He's not the only one to do so. Spamhaus has engaged in some shady behaviour; even pg wrote about it once:

http://paulgraham.com/spamhausblacklist.html (2005)

I wanted to believe him. But before I could reply to his mail, I got first-hand evidence that the SBL has in fact gone bad.

As of this writing, any filter relying on the SBL is now marking email with the url "paulgraham.com" as spam. Why? Because the guys at the SBL want to pressure Yahoo, where paulgraham.com is hosted, to delete the site of a company they believe is spamming.

EDIT

Wait, there's more!

http://paulgraham.com/sblbad.html

http://paulgraham.com/spamhaussbl.html