This feature will probably be only suitable for the 2.x series
the idea is the following; graylisting is efficient only against
spambots which don't retry but has no effect on "true" email
servers and greylisting the latter just means delaying emails

Now; let's say ASSP receives a "tuple" (connecting IP, HELO,
MAIL FROM, RCPT TO); ASSP will now be able to perform some
checks (DNS lookup on the MX for the sending domain, SPF
checks) and, if the sender is a "valid mail source" for a certain
domain, ASSP shouldn't delay it and should instead add the
domain/IP couple to an internal "nodelay list"

I think that the above may allow to fully exploit the graylisting
power and at the same time won't unnecessary introduce
delays for "valid" mailservers :)



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