title: How to re-send external tester invitations on Apple's TestFlight service
body: <p>Is there a way to re-send an invitation to an external tester on Apple's TestFlight Beta Testing service?</p>
  
  <p>(I am referring to facility for external beta testing accessed via iTunes Connect, not to the standalone TestFlight service that has been provided since before Apple acquired it.)</p>
  
  <p>Within iTunes Connect, under My Apps / Prerelease / External Testers, the tester's status just shows itself as "Invited". Unfortunately, this tester had a hyperactive spam filter that simply deletes all spam, so he cannot access the original invitation. And I cannot find any control on the TestFlight UI to re-send it. I have tried turning testing off and on, but this doesn't seem to help.</p>