If you recently changed your password, you also updated your Yahoo! Mail account. Yahoo! Mail doesn’t know if you have a new password unless you enter it. Editing this information in your Yahoo! Mail account settings should correct the problem.

To do it:

1. Click Options in the upper-right corner of your Mail page.
2. Select More Options.
3. Choose Account Information.
4. Enter your password.
5. Under "Sign-in Security", click Change your password.
6. Enter your old password, and your new password.
7. Click Save .

Note: If you update this setting and still have trouble, contact your Internet Service Provider or your work or school’s Network Administrator to see if too many password attempts tripped a switch that temporarily blocks your account.