Exchange 2007 Error #571 BADDNS

Hello,
One of our clients are getting a bounce back from an organization in which they deal with. The bounce back states:

server.somewhere.com #571 Reputation Violation for User e-mail@address.com (BADDNS)

It's the receiving server that is rejecting it, what needs to be changed on the sending server?

Thanks in advance!
esitechAsked:
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FarWestCommented:
Some of the Authentication mechanism for email servers is to do what is called "Reverse DNS Lookup", just like making ping -a and compare DNS record by FQDN to name returned by Reverse Lookup for the IP,
so
ping server.somewhere.com
and ping -a  x.x.x.x (your server IP)
should match
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Shreedhar EtteCommented:
Hi,

Go to http://www.mxtoolbox.com/ and perfom below tests:

a. DNS Lookup
b. MX Lookup
c. Blacklists

I hope this helps,
Shree
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