Tutorials
---------

"SMTP with oauth for gmail." - Aug 2012
https://skroesbergen.wordpress.com/2012/08/22/smtp-with-oauth-for-gmail/

"GOOGLE, SMTP, AND OAUTH2 AUTHENTICATION" - Feb 2013
http://www.chargenevier.com/2013/02/google-smtp-and-oauth2-authentication/

PHP, SMTP, XOAUTH2 and Gmail - Feb 2014
http://www.boxuk.com/blog/php-smtp-xoauth2-gmail/


Creating a Gmail Token
----------------------

Google Developer OAuth 2.0 Playground
https://developers.google.com/oauthplayground/

Google Developers Console
https://console.developers.google.com/

Google Apps Security Settings
https://admin.google.com/AdminHome?chromeless=1&fral=1#SecuritySettings:

Account Permissions
https://security.google.com/settings/security/permissions?pli=1

Rereshing a Token
-----------------
How do I refresh my google_oauth2 access token using my refresh token?
http://stackoverflow.com/questions/12792326/how-do-i-refresh-my-google-oauth2-access-token-using-my-refresh-token



References
----------

Using OAuth 2.0 to Access Google APIs
https://developers.google.com/accounts/docs/OAuth2

Gmail Platform - OAuth 2.0
https://developers.google.com/gmail/oauth_protocol?hl=nl