I have three external (WAN) interfaces to my ASG server, with eth1 being a static ip associated with my mx record/,ail server. I would like to use the "uplink balancing" feature across all three connections, but need to make sure that mail is always sent out through port 25 on eth1. What is the best way to set this up? With a firewall rule or is there some other location/setting to "bind" all port 25 traffic to a single nic?
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