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Re: [Emailcore] MDAs (was: Re: Delivered-To issues)

John R Levine <johnl@taugh.com> Thu, 07 January 2021 21:37 UTC

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Date: Thu, 07 Jan 2021 16:36:53 -0500
Message-ID: <c961c91c-e29a-94aa-62bd-a3c16ded14a@taugh.com>
From: John R Levine <johnl@taugh.com>
To: John C Klensin <john-ietf@jck.com>, emailcore@ietf.org
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Subject: Re: [Emailcore] MDAs (was: Re: Delivered-To issues)
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On Thu, 7 Jan 2021, John C Klensin wrote:
> But, AFAICT, that brings things full circle to John L's point.
> If there are some flavors of MDA that are really part of the MTA
> function and some flavors that are not, then a crisp definition
> of MDA that would fit well into 5321bis may not be possible
> without splitting exactly those hairs.

I took another look and I don't see anything to to change.  It says to add 
Return-Path at final delivery when "the message has left the SMTP 
environment."

The details of when that happens are quite specific to different 
implementations.  For example, on some systems, when one address is 
aliased to another it just substitutes the envelope address within the 
MTA, in others (mine for example) it's delivered to a stub that reinjects 
the message, adding and then stripping the Return-Path.  I am not aware of 
the current language causing any trouble for implementers so I really 
think we should leave it alone.

> Certainly it would be desirable for a description of
> Delivered-To: (or Envelope-To:) in some other spec to reference
> such text if it appeared in 5321bis but, ...

It is my impression that we agree that if it goes anywhere it'll be a 
separate draft.

Regards,
John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly

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