This article describes a step to take if your organization uses a public-cloud hosted email service, but would like to add a new 3rd party hosted mail service in your Client Net portal > Outbound routes > Hosted Email services
Email Security.cloud
The current list of Hosted Email Services in our ClientNet portal includes below services :
Note: If your organization requires to add a new Hosted Email Service which is not listed, Please Contact Support and provide the Name of the Service and Business Justification.