If you are receiving too much spam in your mailbox, please consider enabling the Spam Assassin. You can do this from:
cPanel -> Mail -> SpamAssasin -> Enable SpamAssassin
Spam Assassin is an automated mail filter that uses a wide range of heuristic algorithms on mail headers and message body text to identify "SPAM" (unsolicited email). This software is capable of eliminating more than 98% of all SPAM messages. Its performance depends on the individual configuration, which can be tuned by each website owner. Once identified, the mail is tagged as "SPAM" for later filtering using the user's desktop mail client.
You could also add your own custom filters to improve the functionality of SpamAssassin.