If you have Gmail, you can delete other email accounts by going to the Accounts tab and clicking on the three lines in the top left corner of the screen. This will take you to a list of all your email accounts. On the Accounts tab, you will see a list of all your current email addresses. You can click on any of these addresses to delete it from Gmail.
Log in to your Gmail account and click the cogwheel icon in the top right corner of the screen. Select Settings from the drop-down menu. Click on Accounts and Import tab from the vertical menu on the left side of your screen.
