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Network Security Firewalls
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DNS poisoning?

Subject: DNS poisoning?
Date: Fri, 26 Jan 2007 19:23:57 -0800
Hello,

I'm working through an intermittent incoming email bounce problem I hope
someone can shed some light on.  A few major companies are reporting
intermittent bounces when sending email to us.

Someone forwarded a bounce message which contained the following
information:

  ... connect to mail.greenborder.com [216.52.7.214]: Connection timed
out ...

I do not have a host named 'mail.greenborder.com' in my DNS records.
The IP address is not a mail server, it's an Internap address.
http://www.dnsstuff.com/tools/whois.ch?ip=216.52.7.214

I tried to obtain help through the DNS experts at Network Solutions
through Customer Support; their Customer Support guys are _absolutely
clueless_ on how DNS works.  They keep referring me to 'the provider who
hosts my email service'.

My MX records are here:
http://www.dnsstuff.com/tools/lookup.ch?name=greenborder.com&type=MX
(Temporarily modified for troubleshooting purposes)

greenborder.com. MX IN 7200 USC1.MAILHOSTSXODE.NET. [Preference = 10] 
greenborder.com. MX IN 7200 MAILGATE.greenborder.com. [Preference = 1] 
greenborder.com. MX IN 7200 USP1.MAILHOSTSXODE.NET. [Preference = 5] 
greenborder.com. NS IN 7200 NS31.WORLDNIC.com. 
greenborder.com. NS IN 7200 NS32.WORLDNIC.com. 
MAILGATE.greenborder.com. A IN 7200 66.123.15.52

Any help would be appreciated.

TIA,

Bill Stout

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