What are some alternatives?
When comparing Optiv Security Intelligence and Symantec Email Security.cloud, you can also consider the following products
Alert Logic Threat Manager - Alert Logic Threat Manager is a cloud-based managed intrusion detection and vulnerability assessment solution.
Sophos UTM - Sophos UTM integrates complete security software within a single appliance.
Cylance - Cylance is an endpoint security platform that detects, prevents and blocks threats.
Barracuda Email Security Gateway - Barracuda's Email Security Gateway is a powerful antivirus filter specifically designed to identify and eliminate email-borne threats, stopping hazards before they reach the network.