title: How to create a new GitHub account with the same email address?
body: <p>We are using GitHub Enterprise 2.5.1.</p>
  
  <p>In our company, when a user switches to a new role, a new AD account will be created for him, with a new set of permissions. e.g. my current account is "huj" as a developer with email address "Jirong_Hu@otpp.com, if I become a BA, then: </p>
  
  <ol>
  <li>The old account "huj" will be marked as "OIM Deletion" in AD. </li>
  <li>A new account called "huj2" will be created for me, with the same old email address, Jirong_Hu@otpp.com.</li>
  </ol>
  
  <p>My questions are: </p>
  
  <ol>
  <li>As account is automatically created upon login, if I login to GitHub with the new account "huj2", I got this error: Unable to create the user because email Jirong_Hu@otpp.com is already taken and emails is invalid. </li>
  <li>How can I create the new account "huj2" in GitHub, with the same old email address.  </li>
  <li>What's the consequence of doing the above?</li>
  </ol>