Re: draft-elvey-refuse-sieve-02.txt

[Kjetil Torgrim Homme <[e-mail]>]

Cyrus Daboo wrote:
> The effectiveness of reducing joe-job DSNs depends on exactly how the 
> original spam message is being submitted and sent. If the submission server 
> (MSA) is the client that connects to the final delivery server (MDA) where 
> SIEVE is being run, then the DSN/MDN is avoided. However, if there is one 
> or more intervening MTA's relaying the message, then a DSN will always be 
> generated by the client connecting to the MDA when the script does the SMTP 
> error refuse. So the question is how many messages fall into these two 
> categories: 'direct' delivery vs 'relayed' delivery. That will determine 
> the real effectiveness of refuse.

indeed.  I claim that most spam is submitted directly to an MX
responsible for the final recipient.  the spammer software will
obviously not produce an MDN in response to the DSN.

I want to make it possible to run a user's Sieve script on the border.
this can't be guaranteed in general, but a system designer can make sure
that the MTA on the border supports the same Sieve extensions as the
MDA.
-- 
Kjetil T.