old_contents: 
  '''
  [Google Mail Api]
  https://cloud.google.com/appengine/docs/python/mail/sendingmail
  
   - what is different ?
     :To show that you don't need to use google user authentication to send email.
   - Local google app engine browser won't work, however, once you deploy, it will work fine :)
  '''
  
  
  from flask import Flask
  from google.appengine.api import mail
  
  app = Flask(__name__)
  app.config['DEBUG'] = True
  app.secret_key = str(uuid.uuid4())
  
  @app.route('/')
  def SendMail():
  	message = mail.EmailMessage()
  	message.sender = '___@xxx'
  	message.to = '___@xxx'
  	message.body = 'Hello ! I hope you receive my email :)'
  	message.send()
  	
  	return ''
  
new_contents: '''
  [Google Mail Api]
  https://cloud.google.com/appengine/docs/python/mail/sendingmail
  
   - what is different ?
     :To show that you don't need to use google user authentication to send email.
   - Local google app engine browser won't work, however, once you deploy, it will work fine :)
  '''
  
  from flask import Flask
  from google.appengine.api import mail
  
  app = Flask(__name__)
  app.config['DEBUG'] = True
  app.secret_key = str(uuid.uuid4())
  
  @app.route('/')
  def SendMail():
  	message = mail.EmailMessage()
  	message.sender = '___@xxx'
  	message.to = '___@xxx'
  	message.body = 'Hello ! I hope you receive my email :)'
  	message.send()
  	
  	return ''
  
subject: Update Email.py