charlie derr:
> Pretty sure this is a transport map invocation which is needed.
> 
> Our situation is that we have a server a.example.com which is receiving 
> email for the entire example.com domain. What we wish to do is to have 
> any email that is directed to an example.com email address *not* be sent 
> to the IP which is specified in example.com's MX record. Instead, we 
> need a.example.com to send on (not sure if "forward" or "relay" is the 
> technically correct name for this, or if it ought to be called something 
> else) all example.com email to b.example.com on port 9999.

To forward mail from a primary DNS MX host to a system that is not
a DNS MX host,
https://www.postfix.org/STANDARD_CONFIGURATION_README.html#backup

        Wietse

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