Re: homework, not an experiment, draft-crocker-email-deliveredto

Gene Hightower <[email protected]> Fri, 6 Aug 2021 12:36:21 -0700

Newsgroups	gmane.ietf.smtp
Message-ID	<[email protected]>

On 06/08/2021 11:28, Viktor Dukhovni wrote:

> Well, Envelope-To: records the envelope address as received from upstream,

How does this relate to the mandatory Return-Path: trace header?

From RFC-5321:

   When the delivery SMTP server makes the "final delivery" of a
   message, it inserts a return-path line at the beginning of the mail
   data.  This use of return-path is required; mail systems MUST support
   it.  The return-path line preserves the information in the <reverse-
   path> from the MAIL command.  Here, final delivery means the message
   has left the SMTP environment.  Normally, this would mean it had been
   delivered to the destination user or an associated mail drop, but in
   some cases it may be further processed and transmitted by another
   mail system.

(I'm confused)

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