You can delete Gmail from your Google Account at any time. If you're sure you won't use Gmail in the future, please follow these steps to delete it:
1. Sign in to your Gmail account.
2. Click Settings at the top of any Gmail page.
3. Click Accounts in the Settings menu bar.
4. Click Google Account settings.
5. Click the Edit link next to 'My products.'
6. Click Delete Gmail Service and fill in the required fields.
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If you want to delete your yahoo id...Just click on the following link...it will ask you the confirmation before you are gonna terminate your account...