l carr: > The domains are not defined under mydestination, they are defined > under virtual_alias_domains. So it sounds like the fallback_transport > may not work for us. Is there any other way to accomplish that > same scenario?
That depends on what you mean with 'undeliverable'. Which Postfix delivery agent logs the non-delivery, and what is logged as the delivery status? You can anonymize the email address. (Viktor and I are the main developers, so you're talking to the right people). Wietse