Your hosting includes email with advanced SPAM filtering like Apache Spamassassin. This is controlled by you from your hosting Control Panel (Cpanel or Plesk).
An optimally configured IMAP mailbox enables a Spam email folder called "Spam" where detected SPAM messages are sent to. This keeps your Inbox clean and SPAM-Free :)
Our policy for Spam folders is to automatically delete messages therein after 7 days. This allows you ample time to scan the Spam folder periodically for possible False Positives, or messages that should not be there.