Re: [Jmap] Address Validation (was Re: Submission)

["Adrien de Croy" <[e-mail]>]

I think the problem with lack of support for MDN / DSN in clients may be 
due to lack of implementation in the network of support for it.

If there's still a significant number of deployed systems that don't 
support it, then clients have increased doubts about its worth.  Chicken 
and egg issue again.

I wouldn't presume that the reason that it doesn't appear so much in the 
wild in clients is due to lack of interest.  Maybe some MUA authors 
could be approached for comment.

We looked several times at supporting DSN etc in our mail system, and 
balked at some of the more onerous requirements.

A lot of the extension RFCs have onerous requirements for interfacing 
with non-supporting systems.  8BITMIME springs to mind here.  So we are 
binary safe (even embedded NULLs), but don't advertise 8BITMIME due to 
not wanting to take on the responsibility of what to do when forwarding 
to another server that doesn't advertise it.  Maybe that just makes us 
lame.  Probably should revisit both these.

But we probably aren't the only ones either.

Adrien


------ Original Message ------
From: "Paul Smith" <[e-mail]>
To: "[e-mail]" <[e-mail]>
Sent: 25/04/2017 8:33:24 PM
Subject: Re: [Jmap] Address Validation (was Re: Submission)

>On 24/04/2017 20:25, Ted Lemon wrote:
>>On Apr 24, 2017, at 12:14 PM, Arnt Gulbrandsen 
>><[e-mail]> wrote:
>>>However, the question that I understood was asked upthread is roughly 
>>>"to which recipients has x been delivered already?", and for that 
>>>particular question an unbroken implementation chain is needed from 
>>>sender to recipient.
>>
>>I think even knowing that the MTA for the admin domain of the JMAP 
>>server has successfully forwarded the message would be sufficient to 
>>be equivalent in most cases.   If someone does more, that's great, but 
>>best is the enemy of good enough.
>
>I may be wrong, but I believe you can already do that with DSN/MDNs. 
>However, I have yet to see an MUA which does it even though it doesn't 
>seem like it'd be that hard to do with the MUA requesting success DSNs 
>and parsing the responses.
>
>Maybe the JMAP server could handle the responses and somehow link the 
>status to the sent message?
>
>
>