[120281] in North American Network Operators' Group
RE: DNS question, null MX records
daemon@ATHENA.MIT.EDU (Eric J Esslinger)
Tue Dec 15 10:46:49 2009
From: Eric J Esslinger <eesslinger@fpu-tn.com>
To: "'nanog@nanog.org'" <nanog@nanog.org>
Date: Tue, 15 Dec 2009 09:46:06 -0600
In-Reply-To: <D2D37F15EBBD524693E9F3CB32D02080DA9FE824@exchange.corp.fpu-tn.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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I've had a couple of off-list comments already about using it as/donating i=
t to a spam trap; That is a good idea and I actually thought of that.
However, the address was formerly used for email addresses for our customer=
s and for our business (some 10 years ago it was registered, but has not ha=
d any valid dns records set for roughly 6 years), and we still deal from ti=
me to time with mail being sent to old addresses on that domain for various=
reasons (several dns registrations, for example, we've had to help these p=
eople go through the fax change system because we don't want to go to the t=
rouble of setting up to receive email on this domain again)
So in any case, due to customer privacy concerns we feel we can't do that.
Also I have set the spf -all on it, for those that look for these records t=
o auot-reject email from the domain.
__________________________
Eric Esslinger
Information Services Manager - Fayetteville Public Utilities
http://www.fpu-tn.com/
(931)433-1522 ext 165
-----Original Message-----
From: Eric J Esslinger [mailto:eesslinger@fpu-tn.com]
Sent: Tuesday, December 15, 2009 9:18 AM
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 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
________________________________
This message may contain confidential and/or proprietary information and is=
intended for the person/entity to whom it was originally addressed. Any us=
e by others is strictly prohibited.
This message may contain confidential and/or proprietary information and is=
intended for the person/entity to whom it was originally addressed. Any us=
e by others is strictly prohibited.
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