Yes. WestHost offers a configurable spam filtering tool, beyond the defaults available inside cPanel. This is a third party tool that we have made available to your account as a paid addon.
It is available by logging into your https://cp.westhost.com/ dashboard:
This will have you select the number of domains that you are purchasing the spam filtering add-on for, and pro-rate the remaining charge based on your billing cycle.
If you do not have a valid credit card on file, you will need to make the required payment before the Spam Filtering addon can be added to your account.
Once the addon has been applied and payment for it has been processed, you can find the icon for it in https://cp.westhost.com/ on the Manage toolbar.
Please see these follow up articles on managing your Spam Filtering tool.
Configure your Spam Filter and Connect to your Dashboard
Spam Filter Dashboard Overview
Anti-Spam Filtering Methods