1. Login to cPanel.
2. Locate and click on the "User Level Filtering" icon within the "Mail" category.
3. Locate the user you want to create the filter for and click on the "Manage Filters" link next to his or her name.
4. Click the "Create a New Filter" button.
5. Enter the desired filter. In the example below, we are blocking any emails with "Free Money" in the subject line.
6. Click "Activate" to apply the filter.