Gmail 2 step verification

README.md

@@ -121,6 +121,11 @@ For Gmail support:
     postfix_sasl_password: 'bar'
 ```
 
+If you configure your Google account for extra security to use the 2-step verification, then
+postfix won't send out emails anymore and you might notice error messages in the /var/log/mail.log file
+
+To fix this issue, you need to visit the ([Authorizing applications & sites](http://www.google.com/accounts/IssuedAuthSubTokens?hide_authsub=1)) page under your Google Account settings. On this page page enter the name of the application to be authorized (Postfix) and click on Generate  button. Set the ```postfix_sasl_password``` variable with the password generated by this page.
+
 #### License
 
 MIT