Gmail:
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. Click Settings at the top of any Gmail page, and open the Accounts tab.
2. Click Google Account settings.
3. Click Edit next to My products on the right side.
4. Click Delete Gmail Service.
https://www.google.com/accounts/EditPasswd?hl=en&service=mail
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Hotmail:
http://mail.live.com/mail/CloseAccountConfirmation.aspx
To close a free Hotmail account, sign in to Hotmail using the account. Click Help, and then
follow the instructions in the topic named "Close your MSN Hotmail account."
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Yahoo:
https://edit.yahoo.com/config/delete_user
To remove your entire account, please visit our Account Deletion page. You will be asked to
sign in or verify your password for the account you wish to remove. Please be sure to read
the next page carefully, as important information about your account and account
information is included. You can then confirm the deletion of your account.