But Really: Giving Spammers a Hard Time

Spammers are a pain. How do we deal?

• Spammers send large numbers of messages; you are probably not the first recipient

  - > Known spam senders (hijacked machines) are added to blacklists

• Spammers tend not to obey RFCs (RFC1123, RFC2821/RFC5321)

  - > Greylisting (www.greylisting.org) - with 45n temporary error still works!

An elegant solution is in OpenBSD's base system. Let's take a peek.