title: Sending mail by Unauthorised sender in Google AppEngine
body: <p>I've got a Google AppEngine Python application connected with <strong>my domain</strong>.<br>
  I want to be able to send emails from any email, like: <em>mailname@<strong>mydomain.com</em></strong><br><br>
  So I use sendmail() and set mailobject.sender = "sender@mydomain.com", but it does not work.<br>
  Also I made a receive function, but I don't want to receive mails here, so I just made</p>
  
  <pre><code>def receive(self, mail):
      pass
  </code></pre>
  
  <p>In Google Documentation <a href="https://cloud.google.com/appengine/docs/python/mail/receivingmail" rel="nofollow">https://cloud.google.com/appengine/docs/python/mail/receivingmail</a> :<br></p>
  
  <ul>
  <li>Any valid email receiving address for the app (such as
  xxx@APP-ID.appspotmail.com).</li>
  <li>Any valid email receiving address of a
  domain account, such as support@example.com. Domain accounts are
  accounts outside of the Google domain with email addresses that do
  not end in @gmail.com or @APP-ID.appspotmail.com.</li>
  </ul>
  
  <p>What should I add to the application in order to be able to send mails?</p>