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From: Noel Jones (njonesmegan.vbhcs.org)
Date: Mon May 19 2008 - 11:50:47 CDT
Andy Spiegl wrote:
>> A popular (though never standardized approach) is to use "null MX"
>> example.com IN MX 0 .
>> Point the MX record to "mail.invalid"
> Great idea, but that's allowed accoring to the RFCs ???
It's legal because "invalid." is an official reserved TLD, so
it is a legal host name that will never resolve. This is
similar in concept to Viktor's suggestion of a null host "."
I don't know of any RFC that addresses this issue directly; I
would think RFC-compliant behavior would be any legal host
name that won't ever resolve.