[120277] in North American Network Operators' Group
RE: DNS question, null MX records
daemon@ATHENA.MIT.EDU (Mark Scholten)
Tue Dec 15 10:32:10 2009
From: "Mark Scholten" <mark@streamservice.nl>
To: "'Eric J Esslinger'" <eesslinger@fpu-tn.com>,
<nanog@nanog.org>
In-Reply-To: <D2D37F15EBBD524693E9F3CB32D02080DA9FE824@exchange.corp.fpu-tn.com>
Date: Tue, 15 Dec 2009 16:31:08 +0100
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Hello,
You could use:
Local.example.com. IN A 127.0.0.1
Example.com. IN MX 10 local.example.com.
This way systems shouldn't deliver it at your system.
What you did mention is something we don't allow our customers to do (if I
am correct).
With kind regards,
Mark Scholten
-----Original Message-----
From: Eric J Esslinger [mailto:eesslinger@fpu-tn.com]
Sent: dinsdag 15 december 2009 16:18
To: 'nanog@nanog.org'
Subject: DNS question, null MX records
I have a domain that exists solely to cname A records to another domain's
websites. 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
getting 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 front of it). (The domain name is actually several years old and has been
sitting 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
want 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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