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