The primary use case is to protect the organization from any attack generated via email. As most of the attacks in recent days are via email, the organization has to be equipped and ready to mitigate this type of attack at the perimeter level, before it has been delivered to the user mailbox or endpoint.
Basic anti-spam filters are not capable of protecting against the latest generation of attacks. So, for protecting the organization against this sophisticated or targeted attack, we concluded that the next generation of Email Security solutions is a must. Ultimately, it should be able to protect against any attack that is sent via email.