The examples show Delivered-To: next to the last Received: field, which
implies that Return-Path: is going to get pre-pended after the Delivered-To:
field. If in practice they can appear in either order (which seems perfectly
plausible), that seems like a reasonable thing to mention. ...
Depends on the implementation.
If you want to add helpful advice, I'd also add Sam V's point that it's
widely used to break mail loops. I think that every MDA that adds
Delivered-To checks to see of the message already has the same D-T and if
so drops or bounces the message.
Regards,
John Levine, johnl(_at_)taugh(_dot_)com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly
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