Decius wrote:
]What systems are you using? How effective are they?

Xwall for MS Exchange. Has many mechanisms for spam filtering, including black lists, Bayesian filter, verification of MX, blocking IP subnets, etc...

How well does it work? Not very. I have it configured to grab suspected spam and forward it to the recipient as an attachment. This means the user still gets all the spam, but they can set up rules with "inbox assistant" to delete these messages if they desire. This insures that nothing that is incorrectly detected as spam still gets to the intended recipient.

In my experience, with all the configuration I've done, Xwall grabs about 50% of the spam. Thats not bad, but I'd really like to see it catch closer to 90% and improve its accuracy at what is spam and what is not.

I had users dragging their spam out to a public folder on the exchange server. I would then go thru and manually extract IP addresses to build our own custom black list. I quickly realized this was a full-time job and abandoned it after a few weeks.

Legislation will work for spammers based here in the USA, but what about the scores of spammers in other countries?

Laughing Boy

RE: Spam Filtering