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From: Noel Jones (njonesmegan.vbhcs.org)
Date: Wed Apr 23 2008 - 13:43:25 CDT
> We're gonna setup a postfix antispam-antivirus machine as primary mx for
> our domains that then it will deliver mail to other customer machines...
> so we're gonna clean the mail for them and then if it's ok send to them...
> and have a little doubt... should I use relay or smtp transport? have
> heard relay is advised to use to deliver to internal machines or when the
> postfix machine is a backup mx... but when you have a postfix cleaning
> mail and sending it to customer machines over there?
> Thanks a lot mates!
Generally, use the "relay" transport for mail that you accept
on behalf of another, regardless if the actual destination is
an internal server or off-site somewhere.
But it will work using either relay or smtp.
Postfix uses the transport name for scheduling in the queue.
Deferred mail for the "smtp" transport won't clog up mail for
the "relay" transport (unless there is so much deferred mail
that the whole machine is bogged down).