Working with Exchange

[Drew Marshall]

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On Tue, November 1, 2005 02:08, Mark Presling wrote:
>
> Jon Miller wrote:
>
>>Do it on a domain level, we do this all the time and it works very well,
>> you'll have to set up a relay_domains  for the  mail for the client.
>>The way we've set it up is to accept on postfix -> mailscanner (spam and
>> virus with Sophos) -> postfix -> domains.
>>
>>
> Doesn't Postfix just lookup the MX entries for the domain in
> relay_domains and send it on to the higher priority MX than itself? Do
> you have to run your own internal DNS that flips the MX entries?
>
> What I mean is, if you have your server set up as the MX on the Internet
> DNS servers for somedomain.com (and not their own server), how do you
> use relay_domains feature of Postfix to forward it on to their server
> without DNS changes?

It can be done using internal and external zones but that does make life
far more complex than it needs to be. From the Postfix point of view, just
make an entry in the transport file like:

domain.tld   smtp:exchange.domain.tld #This assumes you make an 'A' record
for exchange.domain.tld otherwise do
domain.tld   smtp:exch.ip.add.ress

and postmap the transport file. There is quite a lot of Postfix stuff in
the wiki (As and when Jules is able to de-smoke it and make it available
again).

AFAIK Exim is fairly similar although it is routers that you configure (I
don't know much about Exim so don't take my word for it ;-) )

Drew


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