Just for the record, Bruce Schneier's monthly newsletter on security issues, CRYPTO-GRAM, is marked as SPAM by Plus.net on my accounts.
Quite amusing. It really should be let through. The header is:
From: Bruce Schneier <schneier@COUNTERPANE.COM>
Reply To: schneier@COUNTERPANE.COM
Subject: [-SPAM-] CRYPTO-GRAM, November 15, 2005
Date: Tue, 15 Nov 2005 02:21:49 -0600