We have two wan interfaces setup and had turned on uplink balancing. However, our mx record only points to one ip on the wan side so I want all our email traffic passing through eth1. I used the example SMTP multipath rule slightly revised:
Position: 1
Source: Internal (this is our internal interface and address on the astaro) (maybe it needs to be the mail server?)
Service: SMTP
Destination: Any
Persistence: By Interface
Bind: External (eth1)
The way I am determining that some of the email traffic is being sent out of the second interface (eth2) is when i send an email to a particular address it comes back non-delivery very fast. Once I take down eth2 and send the email it goes fine. I assume they are trying to reconcile the address it came from with the mx record and getting a failure.
Is my setup incorrect? Is there a service I am missing that also needs a multipath rule?
We are using exchange 2003 with only SMTP as setup for our mail server.
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