title: How to use Gmail Rest API to send emails?
body: <p>I want to use this API <a href="http://www.googleapis.com/gmail/v1/users//messages/send" rel="nofollow noreferrer">https://www.googleapis.com/gmail/v1/users//messages/send</a> to send emails from my android app to different users emails to verify their accounts, reset passwords, etc.., 
  I tried to read the documentation but I did not understand anything.</p>