Set up mail filters to decrease junk mail (also known as spam) in your e-mail inbox. This basic form of filtering uses the spam status header to filter junk mail into a separate folder.
From now on, all incoming e-mail which appears to be "spam" will be automatically moved to the new folder you created.
It is possible for legitimate e-mail to be accidentally marked as spam. Periodically check the contents of this folder to ensure that this has not occurred before deleting its contents.