Sorry, I'm not that familiar with email delivery. Wouldn't this mean all currently installed email services would start being sent with TLS? What is the current behavior? Whenever we add a know configuration field we try to have the previous state as the default value to prevent changing behavior for existing users.

Also, what's up with the `(email_config['enable_tls'] != 'false' && true)`? Why not just `email_config['enable_tls'] != 'false'`