Creating cpanel User/Account Level Filtering to filter certain keyword

Access to your cPanel by accessing the URL as cpanel.domainname/or domainname:2082/and click on the User Level Filtering icon on the main screen of your cPanel interface.

2. Click on [Manage Filters]next to the account for which you wish to add filters.

3. To add a filter, click on [Create a new Filter].

4. In the Filter Name field type in a name for the filter.

5. In the Rulesoption, select From as matches regex and type in the keyword in the text box (eg Viagra) and lastly in the Actions option, select on Deliver to folder and click on Browse and choose on the folder you require (eg :Junk)
6. Finally click on Create to save the rule.