On 15/07/2016 12:55 p.m., Suresh Ramasubramanian wrote:
On 15/07/16, 4:19 AM, "mailop on behalf of Brian Godiksen" 
<mailop-boun...@mailop.org on behalf of br...@socketlabs.com> wrote:

That is what I was thinking.  I wasn’t sure if there is a specific
reason the preference is called out in the RFC.
0 is the lowest preference MX and will therefore be tried first, hopefully overriding any other higher preference MXs that may exist.



Why would any other preference MX exist for a domain not intended to be used for email?





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