North American Network Operators Group
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Re: VeriSign SMTP reject server updated

  • From: Stephen J. Wilcox
  • Date: Sun Sep 21 06:10:50 2003 
On Sat, 20 Sep 2003, Eric A. Hall wrote:

> on 9/20/2003 1:01 PM Matt Larson wrote:
> 
> > We are interested in feedback on the best way within the SMTP protocol
> > to definitively reject mail at these servers.
> 
> You need to:
> 
>  1) fatally reject mail for domains that are not delegated with 5xx
> 
>  -and-
> 
>  2) softly reject mail for domains that are delegated with 4xx so
>     the messages are requeed and may get to an authorized server on
>     the next run
> 
> Used to be able to use DNS for this.

I had a thought, its a hack but..

What if you change the behaviour of the GTLD named daemons to return an NXDOMAIN 
response to any MX queries on non-existent domains, you will then take this 
whole debate on SMTP out of the equation ...

Steve