Re: [ietf-smtp] Delivered-to and Return-path

[John Levine <[e-mail]>]

In article <3073462D484914E07B452E20@PSB> you write:
>If I correctly understand the intended use of Delivered-to and
>the meaning of "added at the time of delivery", I believe that
>the examples in Section 4 are in error. ...

The examples show long standing practice so if they disagree with the
text, the text is wrong.

It is quite common for an MTA to add Delivered-To headers as an
address is internally rewritten or forwarded without also adding a
Return-Path.  I've sent a few examples of MTAs doing that.

This is of course completely consistent with it being a trace header.

As far as loop detection, again, that's existing practice. We can
describe it, without offering advice on what we think the best loop
breaking techniques are. The MTAs that add Delivered-To also count
Received headers since there are plenty of loops that Delivered-To
doesn't catch.

R's,
John