That is what I was thinking.  I wasn’t sure if there is a specific reason the 
preference is called out in the RFC.  

Thanks,
Brian

> On Jul 14, 2016, at 6:34 PM, Mark Foster <blak...@blakjak.net> wrote:
> 
> Surely if the MX record is declared as a . then the preference is irrelevant?
> 
> 
> On 15/07/2016 8:38 a.m., Brian Godiksen wrote:
>> I noticed inconsistencies in how domains are publishing null MX records.  In 
>> RFC7505 it states these records should be published with a preference number 
>> 0.  I am seeing a variety of preferences specified though.
>> 
>> Example:
>> 
>> ;; QUESTION SECTION:
>> ;hotmai.com.                 IN      MX
>> 
>> ;; ANSWER SECTION:
>> hotmai.com.          2530    IN      MX      10 .
>> 
>> Is anyone ignoring the preference number in their implementation?
>> 
>> Thanks,
>> Brian
>> _______________________________________________
>> mailop mailing list
>> mailop@mailop.org
>> https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
> 

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