Originally Posted by Noonien
Seems so we force it. Can you say me what policy can control this so i can check it ?
Service Exclusivity Group > Allow Other Message Services
Set this IT policy rule to False to force outbound email messages through your company’s BlackBerry Enterprise Server and to prevent users from sending outbound email messages using other message services.
Warning: This IT policy rule does not prevent users from receiving inbound messages from other message services.