Spam

Sites

• Senderbase: Biggest spam sources
• spamhaus.org
• http://spam.abuse.net/
• DSHield
• Dutch anti-spam site
• Relay methods used
• A great list of spam lists etc
• If you don't want to be blocked by AOL

Spamfiltering

• SpamAssassin
• Greylisting
• Banner filtering
• assp
• SPF

Tools

• proxytest