You can easily close Yahoo email account by deleting it permanently or for a short span of time just by following below given steps:
- Open Yahoo's "delete user" page and type your username and go to the next step by hitting next.
- Now enter your password. If you have activated the Account Key set up, Yahoo will send a message to your mobile phone to validate you.
- Yahoo will show terms and conditions regarding the account, now press “Continue to delete my account” in red color and again press Continue.
- Enter your email address again. You will be moved to Yahoo account termination page
- Hit yes, terminate this account.
- Now Your account has been deactivated and scheduled for deletion
- Hit Sounds good and comes back to Yahoo's homepage.
These steps are the apt answer for the query of how to cancel the Yahoo account. However, if you want to use the account sign in within 90 days of deletion.
Also read - http://yahoochat.populr.me/how-to-delete-yahoo-account-permanently