[120276] in North American Network Operators' Group
DNS question, null MX records
daemon@ATHENA.MIT.EDU (Eric J Esslinger)
Tue Dec 15 10:18:26 2009
From: Eric J Esslinger <eesslinger@fpu-tn.com>
To: "'nanog@nanog.org'" <nanog@nanog.org>
Date: Tue, 15 Dec 2009 09:17:40 -0600
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
I have a domain that exists solely to cname A records to another domain's w=
ebsites. There is no MX server for that domain, there is no valid mail sent=
as from that domain. However when I hooked it up I immediately started get=
ting bounces and spam traffic attemtping to connect to the cnamed A record,=
which has no inbound mail server (It's actually hitting the firewall in fr=
ont of it). (The domain name is actually several years old and has been sit=
ting without dns for a while)
I found a reference to a null MX proposal, constructed so:
example.com IN MX 0 .
Question: Is this a valid dns construct or did the proposal die? I don't wa=
nt to cause people problems but at the same time, I don't want any of this =
crap to even attempt to deliver on this domain to any of my servers.
__________________________
Eric Esslinger
Information Services Manager - Fayetteville Public Utilities
http://www.fpu-tn.com/
(931)433-1522 ext 165
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