On 7/18/2014 8:40 PM, Mark Andrews wrote:
> "MX 0 ." is also consistent with "SRV 0 0 0 ." which is documented.


Right.  As Tony Finch has also noted.


The specific citation is:

   RFC 2782:

>    Target
...
>         A Target of "." means that the service is decidedly not
>         available at this domain.


d/
-- 
Dave Crocker
Brandenburg InternetWorking
bbiw.net

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