Spam Filtering
From SackWiki
We're running spamassassin for spam filtering. All spam is tagged and let through, so configure your procmailrc or mail client to do the right thing with X-Spam-Status, etc.
It's worth training bayes if you know how (someone should put details here). In addition to the usual suspects, we're also adding things to the mail headers to provide extra clues (if you don't know what they mean, it's not important):
- X-Asn - Provides the Autonomous System Number of the connecting IP address
- X-CIDR - Provides the CIDR block that the connecting IP is from
- X-Amavis-Os-Fingerprint - Provides a very good guess of the OS of the connecting host
The hope for those 3 headers is that bayes will learn something from any patterns that arise (ie this netblock is spammy, windows machines in this ASN tend to send spam, etc)
We're also using:
