Don Calfa wrote:

> Maybe I'm Googling the wrong key phrases but,
> 
> What I'd like to do is setup Postfix with spamassasin to receive 
> incoming mail then forward the mail to a MS Exchange server where the 
> mail is then resolved to a mailbox or bounced back.
> 
> Is that possible?

Yes, you would have your MX DNS record point to the postfix box and have it 
accept all mail for your domain and then pass it on to the exchange box (acting 
as a relay for just that domain).  Last place I worked did that.  Had a third 
party run a Qmail server to accept incoming mail and then used forwarding rules 
to pass it on to the Exchange system.