On Thu, Jun 28, 2012 at 6:24 PM, Matthias Wimmer <m...@tthias.eu> wrote:
>
>
> Well technically I'd say that the (invalid) MX *is* pointing to a domain
> name, but that domain name does not exist.
>
> There is no way an IP address can be in an MX record. There can just be
> some (non-existent) domain, that *looks* *like* an IP address with an
> additional point at the end.
>
> For example: AFAIK "192.0.2.10." is a perfectly valid domain name, it is
> just not present in the DNS.
>
RFC 1035:
<domain> ::= <subdomain> | " "
<subdomain> ::= <label> | <subdomain> "." <label>
<label> ::= <letter> [ [ <ldh-str> ] <let-dig> ]
<ldh-str> ::= <let-dig-hyp> | <let-dig-hyp> <ldh-str>
<let-dig-hyp> ::= <let-dig> | "-"
<let-dig> ::= <letter> | <digit>
--
Jan
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