If you are receiving spam emails, you can use Mail Guard to set up a spam filter.
Once logged into your cPanel hosting account, under the "Mail" section, is an icon for "Mail Guard". If you click on the icon it asks you to choose a domain to log into. From the "Mail Guard" home page, you can now add entries to the blacklist for senders or receivers and you can upload spam emails in the .eml format to start to train your "Mail Guard" to filter out the emails that you consider unwanted spam. You can also set an upper or lower limit for email file size and any emails that don't fit your specified criteria, will not get passed "Mail Guard".