title: Exchange 2007 sending from accepted domain
body: <p>We're opening an US office shortly and i've added the new domain (domainus.com) to our exchange 2007 environment as an "accepted domain" and added some addresses as SMTP addresses to a few members who can receive properly - yey :). </p>
  
  <p>We want to send from these addresses too but I can't figure out how to make this work, I get the error:</p>
  
  <blockquote>
    <p>"You are not allowed to send this message because you are trying to send on behalf of another sender without permission to do so. Please verify that you are sending on behalf of the correct sender, or ask your system administrator to help you get the required permission. "</p>
  </blockquote>
  
  <p>I'm not well versed in exchange so i'm not sure what to search for to try and figure it out. I've tried:</p>
  
  <p>Adding themselves to send to "Delivery options > send on behalf" and I edited the default email address policy for the organisation (which wasn't being applied before.... so I don't think it would make any difference).</p>
  
  <p>Any suggestions welcomed.</p>
  
  <p>Thanks in advance.</p>