>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




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