How do I delete old mail?

Answer 1

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To have your Yahoo! ID and/or Yahoo! Mail account deleted, please submit

[ https://edit.yahoo.com/config/delete_user ]

If you ask Yahoo! to delete your Yahoo! account, in most cases your account will be deactivated and then deleted from our user registration database in approximately 90 days. This delay is necessary to discourage users from engaging in fraudulent activity

Copied From

http://help.yahoo.com/help/us/mail/mdom/index.html

Answer 2

Hit the "Delete" button.