Re: [Exim] MX without A allowed by which RFC's?

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Autor: Dominik Ruf
Datum:  
To: exim-users
Betreff: Re: [Exim] MX without A allowed by which RFC's?
* Kirill Miazine <km-lists@???> [2003-11-19 22:50]:
> * John Dalbec [2003-11-19 16:14]:
> > What RFC allows an MX record (example.com -> mail.example.com say) to exist
> > without an A record for example.com existing?
> No RFC forbids such behaviour.


How about that one? ;-)
http://www.dns.net/dnsrd/rfc/rfc2181.html#10.3.%20MX%20and%20NS%20Records

| The domain name used as the value of a NS resource record, or part of
| the value of a MX resource record must not be an alias. [...]
| This domain name must have as its value one or more address records.

                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

| Currently those will be A records, however in the future other record

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| types giving addressing information may be acceptable. It can also have
| other RRs, but never a CNAME RR.


Additionally, I'm pretty sure any domain whose MX RR entry doesn't have
an A RR will be welcome by the rfc-ignorant.org team for listing in at
least their postmaster.rfc-ignorant.org DNSBL. *eg*

Dominik