>Is there a place that I can list their domains in the Postfix system so that >it ignores the transport map
there's no way to bypass transport.map. It's part of the domain resolution process of transport.map, hosts, DNS >and relay_recipients restrictions whitelist the domain before relay_recipients, exposing postfix to bounced (spam) msgs to bad Imail recipients and postfix forced to create and try to deliver non-delivery msgs. Len