Building the Network You Need with OpenBSD's PF: BSDCan, Ottawa May 6th, 2009
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# Giving spammers a hard time: you're not alone

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!