title: can't send an email with MFMailComposeViewController
body: <p>I'm having trouble sending an email in MFMailComposeViewController from inside my app.  I get a log message that the email was sent, but it never sends to my account.  I have to go to the native Mail app and send it from the outbox.  There is no error telling me way it failed even inside the native app.  Am I missing a privacy setting or something?  This originally worked fine.  I'm having the issue after iOS 10 update.</p>
  
  <pre><code>-(void)sendEmail:(NSString*)email order:(NSMutableArray *)orderA{
  MFMailComposeViewController *mail = [[MFMailComposeViewController alloc] init];
  if ([MFMailComposeViewController canSendMail])
  {
  
      mail.mailComposeDelegate = self;
      [mail setSubject:[NSString stringWithFormat:@"Order #%@ order", storeNum]];
      [mail setMessageBody:[orderA description] isHTML:NO];
      [mail setToRecipients:@[email]];
      [self presentViewController:mail animated:YES completion:nil];
  }
  else
  {
      NSLog(@"This device cannot send email");
  }
  }
  - (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
  {
  switch (result) {
      case MFMailComposeResultSent:
          NSLog(@"You sent the email.");
          break;
      case MFMailComposeResultSaved:
          NSLog(@"You saved a draft of this email");
          break;
      case MFMailComposeResultCancelled:
          NSLog(@"You cancelled sending this email.");
          break;
      case MFMailComposeResultFailed:
          NSLog(@"Mail failed:  An error occurred when trying to compose this email");
          break;
      default:
          NSLog(@"An error occurred when trying to compose this email");
          break;
  }
  
  [self dismissViewControllerAnimated:YES completion:nil];
  }
  </code></pre>