A SpamTrap is a honeypot used to collect spam.
SpamTraps are generally e-mail addresses that are made to recieve spam. SpamTraps are often hidden from view on websites, so that they are only harvested from automated scans. Since no "legit" e-mail is ever sent to this address, any e-mail's that are sent to the Spam-Traps are immediately considered unsolicited.
Clean up your mailing lists. Configure your "Hard & Soft" Bounce values to correctly remove recipient's when needed.
If you are not sending bulk email, then check your website and DNS for signs of comprimise.
When cleaning your mailing lists there are some thing that you can already do:
The best way to solve the problem is to stop your mailserver(MTA) and investigate the mail queues for SPAM messages. When you found an example you can open it to identify its source. By stopping the MTA you will prevent SPAM from being sent out. After solving the problem you must clean your mail queue from all these SPAM messages before starting your MTA again.