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Re: MX record for no-mail domainnames?

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"
>> records:
>> example.com IN MX 0 .
>
> ...
>
>> Point the MX record to "mail.invalid"
>
> Great idea, but that's allowed accoring to the RFCs ???
>
> Thx,
> Andy.
>

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 "."
MX record.

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.

--
Noel Jones