RE: [Asrg] C/R Interworking Framework

At 08:20 AM 6/9/2003 -1000, Peter Kay wrote:

> > -----Original Message-----
> > From: Scott Nelson [mailto:scott@spamwolf.com]
>[...]
> > Setting the MAIL FROM to your address means that you could
> > end up challenging a non-existent address, then the
> > mailer_daemon that bounces the mail back to you. If the C/R
> > system was really broken, it could challenge bounces
> > from a non-existent address endlessly, but in the normal case
> > this is only twice as much work as you need to do.
> >
>
>The MAIL FROM needs to be the address of the challenge sender in order
>to allow CRI systems to interoperate. While some CR systems may inspect
>the header, other systems that bounce the email outright (like ours)
>need to look at the MAIL FROM, for reasons I've mentioned earlier in
>this thread.

This would only be true for C/R systems that interoperate via plain SMTP. I 
don't think it would be a problem to use either an ESMTP extension that is 
defined for DSNs or to define an new ESMTP extension. This way you will get 
around the MAIL FROM<> requirement that is mandated by the RFCs by passing 
the C/R information via such extension.

ALSO, not all C/R systems are using the MAIL FROM <>. Earthlink for 
example, sends out all of its challenges from the same email address 
<automated-response@earthlink.net> (see 
http://www.washingtonpost.com/wp-dyn/articles/A26774-2003Jun6.html).

Yakov

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