Dick Dowdell wrote:
> Graylisting (see http://projects.puremagic.com/greylisting/ for a full
> description) involves logging each incoming piece of mail and rejecting
> it with a 451 (Try again later) message. After a specified period of
> time has elapsed for a specific piece of mail, the server will accept it
> normally.
If greylisting became widespread, spammers would simply resend. There are
huge amounts of money to be made sending spam, and bypassing greylisting
really isn't that hard, once they know that they have to do it. Without
being confronted by fines and jail time, spammers aren't going to stop.
In any event, the three key pieces of information for greylisting are:
The originating IP address
The MAIL FROM parameter
The RCPT TO parameter
All of those are available in the SMTPHandler prior to the DATA command. We
could easily implement greylisting as a fast fail method, but there is not a
pluggable interface for it.
--- Noel
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