We find the solution to be very scalable. 

About 4,000 people use the solution right now. Everyone in my organization uses it. 

Its scalability is good. We can scale up appliances without pretty much any downtime.

If we start with 500 users, we would put one basic appliance or the basic image over there to support up to 500 users. If users are increasing rapidly, we would deploy another appliance in the load sharing mode. It can share the load with the old one. It should be in the active/active mode. It is very easy to deploy. We just need to place the new appliance over there, and then we need to just push the policies that are already there in the management console. We just need to add another appliance to the management console. We don't need to reconfigure everything.

In my organization, there are six or seven people from the deployment perspective. We also have one or two users from the operational perspective.

Forcepoint Email Security is an easily scalable solution.

This is a scalable solution. 

The solution is scalable. If a company needs to expand it, it can do so rather easily.

We have about 500 people using the product currently.

We use both Forcepoint and Symantec and both are good in terms of scalability.

The solution is scalable. I'd rate its ability to expand four out of five. We have different customers that have various amounts of users. Clients range from 100 users to 2,000.

The scalability has been great. If a company needs to expand, it can do so.

At this time, we have 300 to 400 users on the solution. We do not have plans to increase usage right now.

It is scalable. 

The scalability of this solution is average, as it is not easy to scale the solution once you deploy it. You have to plan for the future in the beginning, with your initial device, from day one. Otherwise, it will be a tedious job for scaling up the solution in later days.

The scalability is good, but I don't like it that one has to re-purchase the product every year. 
We have about 500 people currently using the solution.

I have found Forcepoint Email Security to be scalable. You can use one platform to protect customers on different levels.

We have approximately 2000 people using this solution.