Hello, I'm looking for a way to map senders with different sending reputation to specific destination ports (that will eventually be mapped to different sending IPs by the firewall) without hardcoding the nexthop.
sender_dependent_default_transport_maps are working great for setting the transport but I haven't been able to figure out how to go from there to specifying destination port per transport in master.cf. Obviously this could be done with tons of different smtp_bind_addresses but that's much more difficult to maintain. Any advice would be much appreciated.
