Email filters will not process any email messages that are discarded before delivery. The system may discard some email messages before delivery if you select the Discard the email while your server processes it by SMTP time with an error message setting in cPanel’s Default Address interface (cPanel » Home » Email » Default Address). interface.
Generally, the recipient does not receive the BCC field in an email’s header. For this reason, you cannot use the BCC field in a filter.
Login to your cPanel Account
Locate the Email section and click on Global Email Filters
After clicking Global Email Filters you will see the screen shown below
Click Create a New Filter and you will see the screen below
Fill in the fields and choose the drop down options that fit your needs and click create