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We consider security a top priority. We sent an email that we're updating our authentication policies around third-party email access to better protect Yahoo Mail accounts. You may need to update your account settings in third-party programs to use a more secure approach. Read our help article for more information.

Reasons Yahoo deactivates or deletes an account

Depending on your account's history, it's possible for it to be removed from Yahoo and become inaccessible. You can always sign up for a new Yahoo Account, but keep in mind that your old Yahoo ID won't be available for you to use. These actions can result in an account being deleted: