The ACM won't stop spamming me. "Your invitation to become a member", they say. Following the unsubscribe instructions doesn't work. Blocking the sending address doesn't work (they keep changing it). I've resorted to blacklisting *@acm.org.

I'm not the only one, either: http://gmplib.org/~tege/acmspam.html http://fries.net/~david/thoughts/ACM_membership_spam.php

</rant>