title: PreventAppSheet (Use only in Mail) - iOS Mail Payload configuration
body: <p>According to iPhone Configuration Profile Reference documentation, you can set <code>PreventAppSheet</code> to true when sending an Email Payload. When setting <code>PreventAppSheet</code> to <code>true</code>, "[the] account is not available for sending mail in
  third-party applications".</p>
  
  <p>My question is this, How can I test this feature? I have set up a mail account which uses smtp.gmail.com as an outgoing emaill server and <code>imap.gmail.com</code> as an incoming server. I set preventappsheet to true, but I still managed to send emails from third party applications such as Gmail client app, and Mailbox app from iPhone.</p>