Currently our EmailNotificationService needs SMTP authentication.
In some scenarios SMTP Servers do not support authentication or have it disabled.
This means that Alerts cannot be used in these scenarios.
We should allow users of Optimize to disable SMTP authentication:
"email.authentication.enabled" in Configuration
- Emails are still sent with authentication disabled
- Existing authentication-related properties are deprecated
- All email authentication properties exist under `email.authentication.xxx`