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Typically the rDNS points to the external IP of your Exchange server and should linked to your external email domain name. 
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Typically the rDNS points to the external IP of your Exchange server and should linked to your external email domain name.

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I get a error message becouse the rDNS do not match.<br />
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currently i get the ISP name STATIC.KPN.NET<br />
At this time i cannot change the rDNS to vandes.nl<br />
<br />
So instead of changing the rDNS i want to change the helo settings of the server so i get a correct rDNS match.<br />
Is this possible?, or do i get other problems?<br />
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below the error message of the rejected mail:<br />
&nbsp; &lt;we.vandes.loc #5.5.0 smtp;550 &lt;D.Wa@Vir-Ba.de&gt;: Recipient address rejected: Mail appeared to be SPAM or forged. Ask your Mail/DNS-Administrator to correct HELO and DNS MX settings or to get removed from DNSBLs; MTA helo: we.vandes.loc, MTA hostname: unknown[92.64.156.219] (helo/hostname mismatch)&gt; <br />

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I get a error message becouse the rDNS do not match.

currently i get the ISP name STATIC.KPN.NET
At this time i cannot change the rDNS to vandes.nl

So instead of changing the rDNS i want to change the helo settings of the server so i get a correct rDNS match.
Is this possible?, or do i get other problems?

below the error message of the rejected mail:
  <we.vandes.loc #5.5.0 smtp;550 <D.Wa@Vir-Ba.de>: Recipient address rejected: Mail appeared to be SPAM or forged. Ask your Mail/DNS-Administrator to correct HELO and DNS MX settings or to get removed from DNSBLs; MTA helo: we.vandes.loc, MTA hostname: unknown[92.64.156.219] (helo/hostname mismatch)> 


rDNS ISP

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.