claiming to be a host

From: TechSupport <TechSupport@xxxxxxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 19 Jan 2007 12:16:07 -0800

How do I go about to fix the below error on a Win2003 server and exchange 2003?

WARNING: One or more of your mailservers is claiming to be a host other than
what it really is (the SMTP greeting should be a 3-digit code, followed by a
space or a dash, then the host name). If your mailserver sends out E-mail
using this domain in its EHLO or HELO, your E-mail might get blocked by
anti-spam software.
Note that the hostname given in the SMTP greeting should have an A record
pointing back to the same server. Note that this one test may use a cached
DNS record.

mail.cetXXX.com claims to be invalid hostname
'**************************************':
220 **************************************
.

Follow-Ups:
- Re: claiming to be a host
  - From: Andy David {MVP}

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