Basically, cyberis.fr is not a valid email domain. (It is valid as a
domain, but NOT for email) By having neither an MX nor an A record,
they are indicating (possibly in error, possibly not) that they do not
wish to receive email at that domain. They should also not be attempting
to send mail 'from' that domain.
It is entirely legitimate to have a domain which does not have email
service - perhaps they are using it to name the hosts in their lab, or
something else. Just not for email.
It is possible that they never had email setup for that domain, and that
the person/individual/program trying to send you mail is forging their
domain in the sender address (for reasons I'm sure we can guess)
On Sat, 29 Sep 2001, Suresh Ramasubramanian wrote:
> > +++ Odhiambo Washington [exim-users] <29/09/01 11:07 +0300>:
> > FROM:<ptjon@???> SIZE=1971: host mailhost.concentric.net
> > [207.155.198.87]: 451 4.0.0 <ptjon@???>... Sender
> > domain cyberis.fr not found in DNS,or not compliant with section 6.2.7 of
> > RFC 822
>
> $ dig cyberis.fr MX
> ; <<>> DiG 8.3 <<>> cyberis.fr MX
> ;; cyberis.fr, type = MX, class = IN
> ;; AUTHORITY SECTION:
> cyberis.fr. 1H IN SOA fiesta.rmm.fr. root.fiesta.rmm.fr. (
> 2001091401 ; serial
> 6H ; refresh
> 1H ; retry
> 5w6d16h ; expiry
> 2D ) ; minimum
>
>
> No MX record ... or any other DNS records except for the SOA.
>
> ; <<>> DiG 8.3 <<>> cyberis.fr
> ;; cyberis.fr, type = A, class = IN
> ;; AUTHORITY SECTION:
> cyberis.fr. 2D IN SOA fiesta.rmm.fr. root.fiesta.rmm.fr. (
> 2001091401 ; serial
> 6H ; refresh
> 1H ; retry
> 5w6d16h ; expiry
> 2D ) ; minimum
>
>
> > Some people have domains out there which have no A records, no MX records?
> > Or am I becoming stupid by the day?
>
> No you aren't. Either their DNS server is FUBAR, or rmm.fr has nuked that
> site for some reason by yanking out its dns records and stopping DNS services
> for that domain.
>
> -suresh
>
> - --
> Suresh Ramasubramanian <----> mallet <at> efn dot org
> EMail Sturmbannfuhrer, Lower Middle Class Unix Sysadmin
> >
> --
> ## List details at http://www.exim.org/mailman/listinfo/exim-users Exim details at http://www.exim.org/ ##
>
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