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

Wow this thread goes long...

Unlimited Delivered-To: can be added as trace headers, and SOME systems 
will consider if a Delivered-To: token that already exists, is in a 
loop, a 'convenience' of having that trace header in place.  (Other 
systems may use alternative methods of loop tracing, using their own 
methods, and possibly other headers)
Delivered-To: once again, is SIMPLY a trace header, when a MTA hands off 
the message to a system that 'should' know how to handle the message for 
final handling/distribution.
So, RFC's should simply note that it is a trace header, should be added 
to the top of trace headers,period.
.. with a 'side note' that many existing systems assume the token in a 
single Delivered-To: will be unique during the processing of a message, 
and MAY consider an existing Delivered-To: + token as representing a loop.


On 2021-08-07 9:22 a.m., Ned Freed wrote:
> Not quite getting it.
>
> A single token describes all of the recipients? Or do you simply 
> generate more
> than one Delivered-to: in the same message?
>
> Let's make this concrete. We have these aliases:
>
> alias1: local-recipient-1, local-recipient-2
>
> alias2: remote-recipient-1, remote-recipient-2
>
> How many message copies do these generate, and what fields are added?
>
> And while we're at it, what does
>
> alias3: alias3, extra-recipient-1
>
> do?


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