On Mon, 2006-06-12 at 23:00 -0400, Horst von Brand wrote:
> > Greylist those who have not subscribed.
>
> That is not easy to do.
It's fairly trivial with a decent MTA. I use all kinds of conditions to
trigger greylisting -- HTML mail, 'Re:' in subject with no References:,
lack of reverse DNS or CSA on the sending host, >=0.1 SA points, etc.
Adding "is not subscribed to the mailing list they're trying to post to"
should be trivial.
--
dwmw2
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