To recover your deleted Yahoo Mail Account or re-activate your Yahoo Mail account,
- go to Yahoo mail login screen (login using a computer) and enter your Yahoo Email address and password.
- Confirm your Yahoo details and complete the verification.
- After that you will get an option, that is, to re-activate your yahoo mail.
- Click on Re-activate.
Wait till the next day till you can login again as the re-activation of a Yahoo Mail Account takes up to 24 hours or more. So log back in again the next day to check if the account has been activated or not.
If for some reason you have deleted your Yahoo Mail and it has been deleted for more than 90 days that it will not be possible to recover that Yahoo Mail. And Yahoo Mails that has been inactive for more than a year (365 days) are also not possible to recover.