title: SMTP, Anonymous Relay, and Windows 2003
body: <p>Assumption: this is an internal web server</p>
  
  <p>Is there anything special you have to do to get Windows 2003 to act as an anonymous SMTP relay server? I have configured many Windows 2000 servers to do this in the past and never had an issue. </p>
  
  <p>I remember in Windows 2003 Microsoft went a little strong with the security...
  So is there any special registry keys you have to remove to allow this?<br>
  Some policy you have to remove or check for?</p>
  
  <p>I'm currently getting this error:
  The server rejected one or more recipient addresses. The server response was: 550 5.7.1. Unable to relay for bruno.tyndall@somecompany.com</p>