This was not actually as straightforward as configuring other SMTP servers as the details Google publish are not accurate in that the port they list for SSL is not the correct one.
The settings required are below:
The key elements are:
- Server Name – smtp.gmail.com
- Port – 587
The final step required, is to navigate to Less secure apps and change the toggle to On:
With these settings, Gmail can be used to send the Notification Emails.