> Greylist isn't an anti-spam term. While it is used often, it has no > real meaning with anti-spam. > So you'll need to specify your idea of greylisting.
Huh? Other than a misspelling of gray if graylisting isn't an anti-spam approach what do you classify it as?
It certainly can be considered an anti-spam approach -- but as I said, he needs to specify his idea of greylisting. It has different meanings to different people.
While "whitelist" and "blacklist" are pretty well defined (an E-mail that is whitelisted should always be delivered, and an E-mail that is blacklisted should be treated as spam), "greylist" isn't well defined (think about it -- the name implies that it is part-way between whitelist and blacklist, but what is part-way between the two?).
In this case, the URL that was given refers to using 4xx responses for certain (perhaps all?) E-mails. Some people use it to refer to IPs that send both spam and legitimate E-mail. Some people use the term to refer to E-mails that are neither whitelisted nor blacklisted. Others use it to refer to E-mails that [1] are neither whitelisted nor blacklisted, and [2] fail some spam tests and are therefore more likely to be spam than legitimate E-mail. I'm sure there are others with other ideas as to what it means, as well.
-Scott
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