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What we have is:
Public IP. xxx.xxx.101.21 --> MX1 Inbound gateway
Public IP xxx/xxx.198.30 --> TheReal Eamil Server
Both the TheRealEmail server and the MX1 have access to common internal network: 192.168.50.X
The RealEmail server is on 192.168.50.5, and the MX1 server is on 192.168.50.55
What it looks like is that the MX1 server takes the email (as one of the gateways... ) but rather then sending via the intranet 192.168.50.x route, it sends back out to the public I/P to the RealEmailServer.
So we changed it the routing for outbound to:
Routing--> Outgoing Gateway --> 192.168.50.5 (the RealEmailserver)
We want to keep the traffic internal, once the emails are "accepted" by the MX1 server, and send via 192.168.50.X to realEmailserver.
Is it just a matter of making the RealEmailServer as the outbound gateway for the MX1 server??
As I test this, the RealEmailServer tags this from MX1 ( unknown host 192.168.50.X).
There are zero settings that have been made on the RealEmailServer, acknowledging anything about MX1(at all.)
The MX1 has designated:
routing-->IncomingGateway: DomainForward: I/P Address 192.168.50.5
Am testing this as write, but hearing the best practice approach, is desired.