SMTP store and forward requires DSN for integrity

Mon Dec 12 19:23:14 UTC 2005

On 10 Dec 2005, at 16:54, Douglas Otis wrote:

> The BATV is a few lines of code that adds a private tag with a time
> limit set in days. BATV helps dramatically by eliminating the DATA 
> phase
> and all that is involved in handling messages. In addition, once BATV
> becomes more widely deployed, the DSN refusal offers an alert about
> accepting more such messages from that IP address.
>
> BATV will make forged DSNs a thing of the past, irrespective of where a
> recipient list is checked, an AV or SPAM filter is added, etc.

And BATV will never be widely deployed because it breaks every single 
system out there that keys off the return path. And there are a lot of 
these systems.

Matt.

______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please visit http://www.messagelabs.com/email 
______________________________________________________________________