title: What would prevent WordPress from sending emails to non-local email addresses?
body: <p>I have setup our blog on my local machine with <strong>PHP5.3/FastCGI and MySQL (Windows 7/IIS 7.5)</strong>... (FYI - I'm new to Windows Servers and IIS)</p>
  
  <p>I got this message:
  <em>The e-mail could not be sent.
  Possible reason: your host may have disabled the mail() function...</em> when a co-worker clicked the 'lost password' link on the 'wp-login' page.</p>
  
  <p>I defined our network's mail server via 'php.ini' and voila!- Lost password email worked. -or so I thought.</p>
  
  <p>Turns out, emails such as the lost password and new-user (password) are only being successfully sent to users with our mail server's url address (johndoe@horsepowerfreaks.com)</p>
  
  <p><strong>So my question is: Why would WordPress not be able to send emails to email addresses outside our domain? I know the first thing people will guess (as I have) that it is something to do with our mail server (Microsoft Exchange Server)...</strong></p>
  
  <p>Could it be something to do with the config of WP?</p>