Block it through mail.
You should contact yahoo and say somebody hacked in to your account
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unlock yahoo.com
Yahoo customer support tollfree usa and canada +1-844-223-3220
Hotmail, yahoo, google mail and some others.
look on the screen where it says write new message
My yahoo mail id is not opening since 12.11.2011. I am trying several times but it is saying 'incorrect login id and password'. How can I recover my yahoo mail id
Yes, as long as you follow their email address with @yahoo.com
The link for access Yahoo! UK's mail feature by navigating your browser to the Yahoo! UK homepage and clicking on the "Mail" link underneath the "Search" button at the top of the page. From there, you can register for a new account or sign in using your existing account to access the Yahoo! UK mail feature.
not open
You can get a Yahoo! Mail at the link below -