| The silent network: denying the spam and malware chatter using free tools: BSDCan, Ottawa, May 18th 2007 | ||
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Content filtering is expensive. We need to push the burden back to spammers.
spamd “classic” introduced in OpenBSD 3.3 (May 2003):
Tarpit where black listed hosts get stuck - answers 1 byte at the time
Integrated with the PF packet filter (runs anywhere, likely your gateway/firewall, ie MTA agnostic)