[cobalt-users] Help Needed - RaQ4 & Spam/Virus Outbreak!

[Colin Wolff Anderson <colin@xxxxxxxxxxxxxxx>]

Hello, I've been a cobalt-users lurker for the past several months. I have
a lightly-used RaQ 4 that hosts mail and websites for about a dozen
domains. Over the past 5 days, the amount of spam and "latest microsoft
patch" virus emails has skyrocketed. A few users on the machine have gone
from about 5 such emails a day to about 500 a day! My personal email
account gets about 300 junkmails a day, most with 100-200 KB attachments.
A week ago, I rarely got more than 10 pieces of junkmail a day.

I have been reading about the various mail filter options, but would like
to get some real-world opinions, suggestions, and maybe even some detailed
instructions from those that have already been in the trenches fighting
this deluge of junkmail.

Ideally, I would like to block the following:
1) Messages with a certain text string in the subject (most of the virus
emails I get have the exact same subject, usually something with
"Microsoft" or "Windows Patch").

2) Messages with a certain text string in the "from" line (I get a lot of
junk from someone@xxxxxxxxxxxxxxxxxx or something along those lines).

This would cut down on the garbage that's pouring in right now.
Eventually, I would like to add additional countermeasures to reduce the
amount of "new spam".

Please let me know what options would best fit my immediate needs. If you
have gone through this with your own RaQ 4, please let me know what steps
you took. I'm a total spam newbie and don't have time to hose my server...
but at the same time, I can't handle this tidalwave of junk anymore
either.

Thanks in advance! I'll owe y'all a couple beers!

Colin