Helo command rejected: need fully-qualified hostname

I have a Windows 2003 server using IIS and SMTP to send emails to the Internet.  This server (we'll call it REJECTEDSERVER) is used to as an SMTP server for 3 other servers in the same location.  The REJECTEDSERVER however is not on our domain nor will it ever be but we can access it across our WAN.

Recipients are not receiving their emails so we're getting undeliverables:
Your message did not reach some or all of the intended recipients.

      Subject:      
      Sent:      4/8/2010 2:58 PM

The following recipient(s) could not be reached:
      someone@somewhere.com on 4/8/2010 2:58 PM
            There was a SMTP communication problem with the recipient's email server.  Please   contact your system administrator.
            <REJECTEDSERVER #5.5.0 smtp;504 <REJECTEDSERVER>: Helo command rejected: need fully-qualified hostname>

How can I allow REJECTEDSERVER to successfully send mail without being on our domain?
helpdesk_compsychAsked:
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tmeunierCommented:
Please see the section of Microsoft KB article 303734 titled 'setting a fully-qualified domain name"
http://support.microsoft.com/kb/303734 

Set the FQDN of the server to be the public fully-qualified host name.  It does not need to be on your Windows domain, you can feel free to use any Internet DNS domain name.  Make sure that A and PTR records agree with the FQDN you use.

-tom
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