Yes. When you sign in to your business mail account, a cookie is set in your browser for identification and authentication. When you access your business mail, our servers recognize that the cookie belongs to your account. If the cookie has expired or been deleted, that browser cannot be used to view your mail, and you'll be prompted to reenter your password or sign in again. Some services require a more recent cookie, and others will accept the cookie as long as it has not expired.

To use the business mail interface, your browser must accept cookies. If your web browser is set to reject all cookies, you won't be able to use Yahoo products or services that require you to sign in, such as web access to business mail. However, some Yahoo products and services do not require that you accept cookies. For more information about how Yahoo uses your personal information, please read the Oath Privacy Policy.

To prevent someone else from using the Back button or the History function to access your email account, it's a good idea to take some precautions when you're finished using your account, particularly if you use a public or shared computer. Be sure to sign out of your email account, clear the browser's cache, and close your browser so the next person using the computer will be returned to the login screen, not your account, if trying to view the browser history.

Sign out of your business email

1. Hover your mouse over the link with your name or the image next to it.
   
2. Click the Sign Out button in the pull-down menu.
   

Note: The sign-out link and pull-down menu appear differently on the Yahoo home page.

Remember: If you don't sign out, it may be possible for someone else using the same computer to access your account if they return to Yahoo before the login session expires.