How to configure Ubuntu to use postfix against gmail domain with application password

I followed the proceedure here:
http://wiki.linuxmce.org/index.php/Postfix_configured_with_Gmail_SMTP

Only changes I had to make were:

1. Make sure to append the Equifax certificate to the /etc/postfix/cacert.pem
2. Run the postmap commands in the /etc/postfix directory or use the full paths
3. Create an application specific key for postfix from accounts.google.com