spamd and Greylisting-Related Resources
If handling email is part of your life (or is likely to be in the future), you have probably enjoyed the descriptions of spamd, tarpitting, and greylisting in this book. If you want a little more background information than what you find in the relevant RFCs, the following documents and web resources provide it.
Greylisting.org (http://www.greylisting.org/) has a useful collection of greylisting-related articles and other information about greylisting and SMTP in general.
Evan Harris’s “The Next Step in the Spam Control War: Greylisting” (http://greylisting.org/articles/whitepaper.shtml) is the original greylisting paper.
Bob Beck’s “OpenBSD spamd—greylisting and beyond” (http://www.ualberta.ca/~beck/nycbug06/spamd/ ...
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