DNS question, null MX records

Joe Abley jabley at hopcount.ca
Wed Dec 16 05:17:43 CST 2009


On 2009-12-15, at 15:45, Dave Sparro wrote:

> On 12/15/2009 10:17 AM, Eric J Esslinger wrote:
>> I found a reference to a null MX proposal, constructed so:
>> example.com    IN    MX 0 .
>> 
>> Question: Is this a valid dns construct or did the proposal die? I don't want to cause people problems but at the same time, I don't want any of this crap to even attempt to deliver on this domain to any of my servers.
>>   
> 
> Pulling from my often mangled memory:
> 
> This was proposed in a draft RFC that went nowhere.

http://tools.ietf.org/html/draft-jabley-sink-arpa-01

One of the imagined purposes of this draft is to be able to write

example.com.	IN	MX	0	SINK.ARPA.

and be confident that SINK.ARPA does not exist.


Joe



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