title: Jenkins : poll-mailbox-trigger-plugin doesn't work
body: <p>Before two weeks I setup build by email and was every things work fine 
  but before two days I don't know why stop working
  after check it's seem doesn't call 
  "Poll an email inbox Schedule" at all, in log it is always like this "Polling has not run yet."</p>
  
  <p>Test Connection:</p>
  
  <p>"Connected to mailbox. 
  Searching folder...
  Found matching email(s) : 1. 
  Result: Success!"</p>
  
  <p>I have test "Poll SCM" and "Build periodically" it are work fine .</p>
  
  <p>Jenkins ver. 1.614</p>
  
  <p>poll-mailbox-trigger ver. 0.16</p>
  
  <p>in schedule : H/5 * * * *</p>