On 4/11/2025 12:57 PM, Richard Clayton wrote:
> The term forwarding is ambiguous. It is used to mean very different
types of
> behavior.
> *If 'forwarding' means every MTA, this is a massive infrastructure
> change to the entire Internet Mail service. *
> If it only means Intermediaries/mediators that sit between a
delivery and a new
> posting, such as mailing lists, then it has the same adoption
barriers as ARC,
> which has proved challenging.
We mean all the devices between a submission server and the machine
which does final delivery.
Ahh. So the adoption barrier is much, much worse than for ARC. It is
literally every piece of the global email transit infrastructure.
wow.
> Also, Intermediaries don't do delivery. MDAs do. Again, a
technical document
> like this needs to use terminology carefully. Also references to email
> architectural components. Here, I gather, MTA and MDA were conflated.
Although MTA has entered the general discourse, many other terms defined
alongside it have not.
Which is why it is unfortunate that terms have been used casually and
without definition.
>> 3. asserting that it will pass control messages (including
bounces,
>> abuse reports and delivery notifications) back to the previous
>> hop for a reasonable time.
> Asserting to whom? Why?
asserting to the device to which the email is being passed
and why -- because one of our aims was to enable intermediate entities
(such as mailing lists and ESPs) to become aware of delivery failures.
Again: why?
d/
--
Dave Crocker
Brandenburg InternetWorking
bbiw.net
bluesky: @dcrocker.bsky.social
mast: @[email protected]
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