John C Klensin <john-i...@jck.com> wrote:
>
> IN MX 0 .
>
> At least in the near term, some SMTP Server ("MTA")
> implementations will conform to that rule (many already use it)
> and some won't. For the latter, they will presumably do what
> the SMTP specs say to do. In summary, that is to look up the
> address(es) associated with the root and try to open a mail
> connection to one of them.
There are no addresses associated with the root, so the mail server will
immediately report a delivery error. RFC 5321 section 5.1 paragraph 2
final sentence.
The SMTP server will not try to connect to the root name servers, as your
message suggested.
Tony.
--
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