Most filtering of unsolicited automated email (also known as spam or junk mail) is handled by a spam filter before those email messages reach your Inbox.
Email that might possibly be junk mail, but is not certain to be junk, is placed in your Junk folder. You can review these messages and either move them out of the Junk folder or delete them. If you do not move or delete the messages, they are purged after 60 days.
If you are receiving many unwanted email messages, contact your administrator. Reporting email as spam helps your email administrator to fine-tune spam filtering.