OT: "Nolisting"

[Gareth]

Its possible but there are still broken email servers out there which
only ever try sending mail to the first mx entry.

Greylisting is still a far better approach. Its also better in that
regular senders get their mail through a lot faster as it is
automatically accepted the first time. If you used the nolisting
approach all email will be delayed until the 1st connection times out.

On Tue, 2008-05-27 at 13:26, Paul Welsh wrote:
> Hi all
>  
> I have read that one way of blocking spam is to use a lowest priority MX
> record that points to a host that doesn't respond to SMTP requests.  I've
> seen this idea coined as "nolisting".
>  
> The idea is to block the many spammers who target the lowest priority MX,
> eg, the one with priority 90 rather than 10 as a way of trying to circumvent
> anti-spam measures.  If the MX with the lowest priority doesn't respond then
> the spammer doesn't try the higher priority MX but just moves on to the next
> victim.
>  
> Any thoughts on this idea?
> 
> Personally, I can see how it would block a percentage of spam but whether
> that percentage is high enough to make it a worthwhile idea is open to
> question.
> 
> Regards
> 
> Paul
> 
> 
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