Re: [ietf-smtp] homework, not an experiment, draft-crocker-email-deliver

> On 6 Aug 2021, at 10:30 am, Dave Crocker <dhc(_at_)dcrocker(_dot_)net> wrote:
>
> > If you want a header that records the envelope address, Exim calls that 
> > Envelope-To:
> > I don't see any benefit to conflating that with a loop breaking token.
> Why use one field that is sufficient when we can pretend two are needed?
Well, Envelope-To: records the envelope address as received from upstream,
e.g. in the "RCPT TO" command.  While "Delivered-To:" is some internal
representation of the receiving mailbox for loop detection.

The former can be expected to match a usable email address as specified
in the incoming envelope.

So the two are in fact semantically distinct, even when they happen to
coincide in the absence of rewrites, hashing, ...

-- 
        Viktor.

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