Deep Packet Inspection: This allows the firewall to examine the data within packets, identifying and blocking malicious content. Intrusion Prevention Systems (IPS): NGFWs can detect and prevent intrusion attempts, such as unauthorized access to email servers. Application Control: NGFWs can manage and control applications that access email servers, ensuring only legitimate applications are used. SSL Inspection: NGFWs can inspect encrypted traffic, ensuring that threats are not hidden within SSL/TLS encrypted emails. URL Filtering: This feature blocks access to known malicious websites that might be linked within an email.