title: laravel not sending out mail when mail implements ShouldQueue
body: <p>I have my mailable class set up to implement the ShouldQueue interface, and also using the Queueable trait. Now, when I send the mail, it goes to the jobs table, <code>php artisan queue:work</code> runs the jobs without failure, I can see that the job has been processed, but I don't get the mail in my inbox.</p>
  
  <p>However, when I remove the ShouldQueue from the implemented interfaces, the mail gets sent fine and I get the mail in my inbox.</p>
  
  <p>Also, whenever I'm on local, the queued mail gets sent and I can see the mail in my inbox.
  Any idea what the problem could be?</p>