Email sending limits and spam protection in WHM

How to set the max hourly email limit for VPS/Dedicated server through WHM:

1) Login to the WHM of the server as root

2) Click on File:Tweak settings.JPG Under the File:Serv config.JPG section

3) Click on the tab

4) Scroll down to the field

5) Change the field from "600" to what you require

6) Scroll down and click File:Save.JPG