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Re: [Emailcore] Delivered-To issues

Jeremy Harris <jgh@wizmail.org> Sat, 02 January 2021 21:56 UTC

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From: Jeremy Harris <jgh@wizmail.org>
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Date: Sat, 02 Jan 2021 21:56:49 +0000
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Subject: Re: [Emailcore] Delivered-To issues
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On 02/01/2021 21:09, John C Klensin wrote:
>  if "Envelope-to" actually has the semantics of "relevant
> RCPT to associated with the current delivery" (Jeremy, I think
> that is the case in exim, but please confirm)

Yes.

Though it can be a list of such RCPTs, given aliasing that
results in a single message delivered from a single SMTP
session (after deduplication during delivery).

> Should we be defining both, making it clear that they are
> different, and then making whatever recommendations seem
> appropriate about which one (or both) should be provided?

I agree that Envelope-To: and Delivered-To: are different.

I'm not convinced that this document is the right place
for either.  I guess there's a benefit in writing down the
definitions somewhere; the cost is "only" cruft that
obscures the minimum requirements for implementing an MTA.
-- 
Cheers,
   Jeremy

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