Hello, Postfix currently allows two modes of operation when a message arrives at the target more than once:
1. With recipient deduplication, but no X-Original-To header(enable_original_recipient=yes) 2. With X-Original-To header, but no recipient deduplication (enable_original_recipient=no) Which desired behaviour most useful depends on the recipient -- some recipients will benefit from the X-Original-To header [a service bot with many names, for instance] and many others benefit from deduplication [human list members, for instance]. The two desired behaviours seem unrelated, except for technical reasons. As a possible remedy that decouples the desires, I propose to add a third mode: 3. With possibly multiple X-Original-To headers (or one header with multiple addresses) as a result of recipient deduplication (enable_original_recipient=collect) This would benefit both use cases mentioned, making it less difficult to choose from for email administrators. I hope this is a useful suggestion :) Thanks, Rick van Rein InternetWide.org / ARPA2.net / OpenFortress.nl
