You might have created an email address, which you no longer want to use. Here is how to delete Google, and Yahoo mail accounts.
- Go to Settings (at top right of Gmail page).
- Go to Accounts tab.
- Click on Google Account Settings.
- Click on Edit next to My services.
- Now you can delete individual services like Gmail, Orkut, etc. or you can delete the whole Google account.
- Go to this page.
- It will asks you to login.
- Then it will show you consequences, and asks for password.
- Click on Terminate this Account button. Thats it.