Strange MX Record for altavista.com
Mark Andrews
Mark_Andrews at isc.org
Wed Sep 1 21:56:44 UTC 2004
> There is a mail system here that has mail queued for altavista.com.
> dig reports:
>
> atalanta% dig altavista.com mx
>
> ; <<>> DiG 8.3 <<>> altavista.com mx
> ;; res options: init recurs defnam dnsrch
> ;; got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 5, ADDITIONAL: 0
> ;; QUERY SECTION:
> ;; altavista.com, type = MX, class = IN
>
> ;; ANSWER SECTION:
> altavista.com. 10M IN MX 0 .
>
> ;; AUTHORITY SECTION:
> altavista.com. 10M IN NS ns4.yahoo.com.
> altavista.com. 10M IN NS ns5.yahoo.com.
> altavista.com. 10M IN NS ns1.yahoo.com.
> altavista.com. 10M IN NS ns2.yahoo.com.
> altavista.com. 10M IN NS ns3.yahoo.com.
>
> ;; Total query time: 65 msec
> ;; FROM: atalanta.ctd.anl.gov to SERVER: default -- 146.137.64.5
> ;; WHEN: Wed Sep 1 16:27:21 2004
> ;; MSG SIZE sent: 31 rcvd: 142
>
> atalanta%
>
> That is a strange MX record. When that mail system (MX Exchange)
> tries to send the mail, it opens an SMTP port 25 connection to one of
> my DNS servers. Is this what is supposed to happen? Thanks.
> ----------------------------------------------------------------------
> Barry S. Finkel
> Computing and Instrumentation Solutions Division
> Argonne National Laboratory Phone: +1 (630) 252-7277
> 9700 South Cass Avenue Facsimile:+1 (630) 252-4601
> Building 222, Room D209 Internet: BSFinkel at anl.gov
> Argonne, IL 60439-4828 IBMMAIL: I1004994
It's an attempt to say "don't sent mail to the domain
altavista.com." It's a pity it is not been codified
AFAIK.
I would be teaching my MTA to treat a MX record like
this as a indication to just bounce the mail.
Mark
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews at isc.org
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