[Simple] MSRP DSN Status codes

[Eric Burger <eburger at brooktrout.com>]

I still don't get it.  The purpose of a DSN status code is to let you know
that the delivery failed and why in an environment where you don't have a
*direct* connection to the recipient.

Clearly, DSN is a relay ONLY thing.  Why?  Because section 6.6.5.7 goes to
great lengths to say that a 200 OK response becomes a 2.0.0.

This is insane.  You would get the 200 OK response, and know the message was
delivered.  End of story.

In a failure mode, you would get the 500 response, or just not get one.

If we're talking relays here, then why are relays not proxies, issuing
100-class responses to message accepted for relay and 200-, 500-, timeout,
or whatever they get from upstream upon failure?  That would make the whole
REPORT thing obsolete and keep everything within MSRP.

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