On 18/03/2010 13:53, Jonathan Tripathy wrote:
So, back to postfix, can it do such a thing? Act as a "proxy" and not a "store and forward relay"
In SMTP terms, a proxy is effectively the same thing as a store-and-forward relay. But yes, Postfix will do this very well. For inbound mail, you can set up a transport map so that all incoming mail is forward to the "true" mail server inside the CDE. Use recipient address verification to make sure that you don't become a backscatter source, and it will do exactly what you want with minimal hassle. For outbound mail, simply use the DMZ machine as a smarthost for any machine inside the CDE (including your Exchange server if appropriate).
Mark
