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

> >> 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?

> This is the sort of thing we can describe in the survey of existing usage,
> for the benefit of people less familiar with the way mail systems work.

> When mail systems do internal forwards using things like .forward or
> /etc/alias, each forward adds a Delivered-To, which breaks a->b->c->a
> loops.  Since there's no SMTP involved, there's usually no Received and
> never an Envelope-To.  Also, as Sam, Viktor, and I have explained, the
> internal forwards are not necessarily to or from anything that has an
> externally valid envelope address.

What happens when there are multiple recipients? Message splitting?

				Ned