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From: Dennis // supportpowerhosting.dk (supportpowerhosting.dk)
Date: Wed Dec 10 2008 - 09:38:17 CST
I manage a few postfix spamfilter gateways for my company.
They are doing a really god job of scanning mails and delivering them to
The way we implement this is using a catch-all address to accept all
mail for customers domains, then scan the mail and try to deliver it to
the customers mailserver.
This is of course a less than ideal solution, as i´m currently accepting
a lot of mails for remote-addresses that are non-existing. Which means a
few 100k mails scanned every day just to have the remote server bounce
it as the recipient does not exist.
I then thought of using the "reject_unverified_recipient" parameter,
thus letting the spamscanners probe the remote mailserver to see if the
recipient is valid or the mail would bounce.
My questions are:
As the spamscanners are the best or primary MX´s
for the customers domains, would postfix then just probe itself, and
always get a positive answer due to my catch-all entry ?
Or would postfix actually look at the transport map, and realize that it
has to probe the customers server. ?
And how would one go about controlling the destination of the
Any other obvious things I need to pay attention to in this situation ?
Med Venlig Hilsen - Best regards
Dennis - supportpowerhosting.dk