This change will allow for user registration when users are federated
through oidc provider even if the general signup is disabled
additionally the users email address can now be automatically set as
trusted. This will force corporate users to signin using SSO instead of
creating manual accounts.
Introduces the ability to use anonymous SMTP authentication where no username or password is provided.
Also introduces a new flag to disable TLS avoiding cases also where STARTTLS is used despite `secure` being
set to `false`
Rene Steen