> "Is the backup on the same network as the primary? Do you have it > listed as > a trusted machine in the local.cf file?" > > The backup is not on the same network as the primary and it is > not > listed as a trusted machine in local.cf. My setup is like yours, if the > primary goes down for maintence or whatever the backup holds messages > then > relays when the primary is back.
I'd look into the headers then and look at the flow to make sure you are seeing flow that you expect. We do a lot of bouncing of mail on odd ports internally to different servers (as each server provides a different service) and each port has different rules setup. What MTA are you using?
