Variation on the greylisting idea

["Vincent Untz" <vuntz gnome org>]

Hi,

I just read the mailing list archives and saw that greylisting was
proposed a few weeks ago, but some people don't like it (which is
understandable).

Another approach could be to greylist only mails coming from domains
in a rbl database. This makes it possible to use greylisting for the
most probable spam sources.

Whitelister is a project that does exactly this (page is in French):
  https://projects.aaege.net/mailtools/wiki/Project.Whitelister
README:
  https://projects.aaege.net/mailtools/file/trunk/whitelister/README

I'm not sure if it'd be easy to get this on the servers though (you
need ocaml to compile it).

Vincent

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