OT: "Nolisting"

[Alex Neuman]

I've seen this done with some domains and working very well. In fact,  
some people will set it up this way:

mydomain.com.	IN	MX	0	somethingthatdoesntrespondtoport25.mydomain.com.
mydomain.com.	IN	MX	10	mail1.mydomain.com.
mydomain.com.	IN	MX	20	mail2.mydomain.com.
mydomain.com.	IN	MX	30	somethingthatdoesntrespondtoport25.mydomain.com..

That way  you're covered on both ends.


On May 27, 2008, at 7:26 AM, 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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