Re: [EAI] Re: From Jari: Re: Your DISCUSS on draft-ietf-eai-framework-05 (fwd)

["Charles Lindsey" <chl at clerew.man.ac.uk>]

On Thu, 08 Mar 2007 16:49:56 -0000, John C Klensin <klensin at jck.com> wrote:

> --On Thursday, 08 March, 2007 17:59 +0200 Kari Hurtta
> <hurtta+gmane at siilo.fmi.fi> wrote:
>
> > "Charles Lindsey" <chl at clerew.man.ac.uk> writes
> > in gmane.ietf.ima:

> > > If a server advertises UTF8SMTP, then it is ofering a
> > > guarantee:
> > >
> > >     "Either I will ensure that this messages is handed off,
> > >     in exactly the  form received, to some
> > > user/mailbox/store/system/whatever that is willing  to offer
> > > essentially the same guarantee; OR I will downgrade it before
> > >     passing it to any
> > > user/mailbox/store/system/whatever that cannot give that
> > > guarantee; OR I will send it back up the Return-Path with an
> > >     explanation that it  could not be delivered."
>
> ok.  But, for the case that Jari was concerned about, the second
> option is eliminated since it cannot be guaranteed that
> downgrading and subsequent reading by a legacy system will not
> lose any information.

I don't see that. We have carefully defined the downgrading process so  
that downgraded headers get replaced by a Downgraded: <header-name> : <RFC  
2047 stuff>. So we now have a valid ASCII email, but no information has  
actually been lost (though it might be inconvenient to extract it).

So, so long as downgraders between the MDA and the actual mailboxes stick  
to our 'downgrade' draft, everything should be OK.

--
Charles H. Lindsey ---------At Home, doing my own thing------------------------
Tel: +44 161 436 6131 ;                      
   Web: http://www.cs.man.ac.uk/~chl
Email: chl at clerew.man.ac.uk      Snail: 5 Clerewood Ave, CHEADLE, SK8 3JU, U.K.
PGP: 2C15F1A9      Fingerprint: 73 6D C2 51 93 A0 01 E7 65 E8 64 7E 14 A4 AB A5

_______________________________________________
IMA mailing list
IMA at ietf.org
https://www1.ietf.org/mailman/listinfo/ima