On Fri, 05 Feb 2021 11:56:55 +0100, Alessandro Vesely said:
The Delivered-To: header field is added at the time of delivery, when
responsibility for a message transitions from the Mail Handling
(Transport) Service to an agent acting on behalf of the specified
recipient address.
It's a plausible design that the agent doing final delivery accepts
responsibility for delivery to multiple local mailboxes (I've often had things
that ended up delivering to root@localhost and valdis@localhost with one
invocation of the local delivery agent, for example). Should the agent
generate two Delivered-To: headers, or does it *actually* get generated
appropriately for each copy (at a time later than when the agent accepted
responsibility)?
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