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Re: SMTP store and forward requires DSN for integrity

  • From: Matt Sergeant
  • Date: Mon Dec 12 14:24:40 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.


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