How can I retrieve my mail from a previous email account?

I can not remember my previous email account ID or password. How can I get in it to get my mail?

How can I retrieve my mail from a previous email account?
To sign in to your Yahoo! Mail account, go to:


http://mail.yahoo.com





Then enter your Yahoo! ID and password in the spaces provided and click the "Sign In" button.





If you've signed into your Yahoo! Mail account within the past eight hours and didn't click the "Sign Out" link on the top-right area of the page at the end of your session, your user cookie will still be active and will log you in automatically by going to:





http://mail.yahoo.com





Also, your Yahoo! ID may already be listed on the Sign In screen if you have used the same computer to log into Yahoo! Mail or one of Yahoo!'s other personalized services (such as My Yahoo! or Yahoo! Chat) on a previous occasion. To sign into a different Yahoo! Mail account, just click the "Sign in as a different user" link.





Signing Out:


To prevent someone else from using the "Back" button or the History function, each time you exit your account you should sign out, close the browser, and clear the cache. Another person on the computer after you would be returned to the login screen each time they try to view the history. This is especially important if you use a public or shared computer.





To sign out:








Click the "Sign Out" link in the upper-right area of the page.


Click the "Return to Yahoo! Mail" link.


While using Yahoo! Messenger, if you check the "Remember ID %26amp; Password" box during sign in, the Yahoo! Messenger software client will sign into your account and connect whenever the program is started. Additionally, the Yahoo! Messenger client may automatically open a browser and automatically sign into your Yahoo! account.





To stop that from happening, you should make sure the box is not checked next to "Automatically sign me in to Yahoo! Mail, Address Book, and Calendar when I click on a link to them from Messenger." That preference is found in the Yahoo! Messenger client, under "File %26gt; Preferences %26gt; General." To learn more about Yahoo! Messenger or to read the answers to general questions, please visit the Yahoo! Messenger help pages.





If you don't sign out, it will be possible for someone else using the same computer to access your account if they return to Yahoo!. Within eight hours of your last login, they will have access to your Yahoo! Mail account. If you only log out of Yahoo! Mail but not your Yahoo! account, that person will have access to many other parts of your Yahoo! account, including your My Yahoo!, Briefcase, etc.
Reply:u have 2 know 1 of those or u cant get in it. sorry.