title: Getting default email address on Mac OS X
body: <p>I'm trying to get the current user's email (if any) so that I can create a customized "contact us" message.</p>
  
  <p>The code is in C. I've tried with AddressBook.framework but I can't find a way to get the email address.</p>
  
  <p>Anyone knows how to get the email address?<br>
  Thank you.</p>