Click on “Mail Settings” link from the top-right corner of your account page. Head to the Filter tab to create a new filter then click on “Create a new folder”. At the “Has the words” box, put is:spam and click Next Step.Once you click on the Next Step button, a warning message appears. Simply, ignore this warning and click on OK. Now check into the box Delete it. You can also apply this filter on the existing spam emails in your account by selecting the appropriate option. Finally, click on Create Filter. Once you configure and create the filter properly, all the incoming mails which are flagged as spam will be automatically deleted.