my home-made & c 99 % effective spam filter via .procmailrc contains:
# Try to filter Kleze
:0
* ^Content-Type:.*html
kleze
:0
* ^Content-Type: multipart
kleze
Except the second rule would catch:
a) all messages on this list b) pgp/mime signed messages
Bye -- Luca Olivetti Note.- This message reached you today, it may not tomorrow if you are using MAPS or other RBL. They arbitrarily IP addresses not related in any way to spam, disrupting Internet connectivity. See http://slashdot.org/article.pl?sid=01/05/21/1944247 and http://theory.whirlycott.com/~phil/antispam/rbl-bad/rbl-bad.html
pgp00000.pgp
Description: PGP signature