On 2013-10-30 14:48, Benny Pedersen wrote:
Dave Warren skrev den 2013-10-30 22:08:

192.2.0.55 has a TLD... 55.

dig 192.2.0.55

what name have the nic ns then ?

None. That's actually my entire point.


Since the 55 TLD doesn't exist, you get a NXDOMAIN from the
root-servers and reject the mail.

you could say it that way yes, but its still incorrect

How is that incorrect? The RFCs specify how to describe an address literal, anything else should be treated as a domain name. 192.2.0.55 is no different than hello.example or aaaaaaaaaaaaaaathisisjustanexample20131030.com, both the MX and A record lookups return a NXDOMAIN, and so the mail is not deliverable.

--
Dave Warren
http://www.hireahit.com/
http://ca.linkedin.com/in/davejwarren

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