Where are Email Filters kept?
There are two locations for Email filters. The first is within cPanel under the "Email" Section. You may find email filters there under "Global Email Filters". These filters are applied account-wide, though if you are looking for email address specific filters, these can be accessed via the Webmail interface. From cPanel, access "Email Accounts" and then select "Manage Email" on an address that you would like to review. From here, there will be an "Email Filters" section on the page, which goes over a specific mail account's filters. Both interfaces have further documentation here if need be: