How to Reopen My Yahoo! Email
The Yahoo! Mail email service gives you the ability to close your Yahoo! Mail account if you so choose. After closing your account, you can reopen it by logging in and following the onscreen instructions, as long as it has been less than three months since the account has closed. If you want to reopen your Yahoo! Mail account, you can do so in a few simple steps.
Open a Web browser and navigate to the Yahoo! Mail sign-in page.
Type the email address and password for the Yahoo! Mail account you want to reopen in the spaces provided and click the "Sign In" button to sign in to your account.
Click the "I can't access my account" link and follow the onscreen instructions to reactivate your Yahoo! Mail account. You will be asked for the identifying information you used to open the account the first time, such as your birth date and nationality.