Simply log in to Your Email account and follow the given instructions;

• Open your account and select extra emails from the inbox and click on Delete icon there. Delete as many emails as you want. But never empty your Trash Folder.
• Keep your Cursor on Empty Folders, a small tab will appear. Now click on Delete Folder option.You can later access to deleted emails in your Trash can.
• In order to increase your space, Report to all unwanted Spams.