Enterprise Administration and Audit
Gateways are a mandate component of every IT security infrastructure as it sits at the very beginning of any network right after a router and a firewall and handles unrestricted internet traffic. In other words, without the right gateway management solution, you would have no way to control and monitor protocols such has SMTP, HTTP/HTTPS, FTP/FTPS, etc.
Which is why, having just a firewall is not enough. Especially with the internet threats increasing by the day, no organization is safe and hence at least being able to control and manage your email and web traffic will provide the leverage to avoid most of the common types of attacks and also be able to increase employee productivity by reducing spam and control web based traffic.