If you accidentally deleted emails or feel you've lost some for an unknown reason, Yahoo has a restore process for you to get them back by restoring your mailbox to an earlier time. To recover old yahoo emails » , you need to log in to your Yahoo mail account and then click on the gear icon. Then select help from the menu options, and enter restore lost or deleted emails in the search help field. You need to click restore lost or deleted emails or IMs from the list and then click on the restore help link at the end of the article on the restore lost or deleted emails. Then follow the on-screen instructions for further process.

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