SonicWALL

Although a firewall will prevent a degree of email based threats, dedicated email security appliances, either physical or virtual, are designed purely to focus on this area of vulnerability. Providing superior protection from inbound and outbound threats - including spam, phishing, zombie attacks, malware, and even ransomware, they also minimize deployment, administration and bandwidth expenses.

A firewall is a device that monitors network traffic from the outside world to protect against cyber attacks and security threats.

These firewalls offer hardware-based deep packet inspection, linked to various software signatures for protection from anti-virus, anti-spam, or phishing threats. They are often referred to as UTM devices (Unified Threat Management), however If a higher degree of security is required, then a Next Generation Firewall (NGFW) should be considered.