Re: draft-ietf-fax-esmtp-conneg-08.txt

At 09:49 16/07/03 +0200, Dave Crocker wrote:
>VGMG>  I
>VGMG> believe that failing a message for non-support of an optional
>VGMG> ESMTP extension is a drastic step, and I believe unprecedented.
>
>Is there is technical deficiency with the specification?  Is there some
>reason the specification will not work?

I don't believe this is unprecedented...

The DELIVERBY extension does something similar when the appropriate options 
are selected by the sender, and delivery cannot be completed within the 
requested period:

[[
4.1.4.1.  Relaying a message with a by-mode of "R"

    A message for which a by-mode of "R" was specified MUST NOT be
    relayed to a SMTP server which does not support the Deliver By SMTP
    service extension.  Moreover, the server to which it is relayed MUST
    NOT have a fixed minimum by-time which is greater than the time
    remaining in which the message is to be delivered.  The fixed minimum
    by-time is expressed by the optional deliverby-param discussed in
    Section 2.

    If the message requires relaying in order to be delivered yet cannot
    be relayed, then the message is deemed to be undeliverable for
    permanent reasons and Section 4.1.2 should be applied.
]]
-- http://www.rfc-editor.org/rfc/rfc2852.txt

#g


-------------------
Graham Klyne
<[email protected]>
PGP: 0FAA 69FF C083 000B A2E9  A131 01B9 1C7A DBCA CB5E