On Wed, 30 Nov 2005, Julian Mehnle wrote:
system might perform. Only if the receiver system accepts the DATA
command and the message data with a 2xx status code, should the
forwarding/relaying/proxying system "accept" the message vis-a-vis the
calling system. (Or of course if the receiver system isn't reachable.)
As a backup MX, you might consider accepting the message only when the reciever
system *isn't* reachable, rejecting the rcpt envelope with 4xx when it *is*
reachable. Normal senders should use the primary MX when available.
Only spammers will try a backup MX first, hoping for weaker spam
defenses.
--
Stuart D. Gathman <stuart(_at_)bmsi(_dot_)com>
Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flamis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.
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