Another method of preventing spam is blocking an individual address. Once you have logged in to cPanel, click on "Mail" from the menu and choose the "Email Filtering" function. From here you will be able to see the filters and set new ones with the help of the link below that will help you control the entries in the mail account. Sender Subject Message header Message content
Please be cautious when using this facility to ensure that you are not blocking legitimate emails or even all emails. Also, please do not use special characters (hash, asterisk, hyphen, etc.) in the blocking rules because they may cause damage to your email.
Careful! this option is only valid for Linux hosting accounts.