If you discover messages in your Sent Mail Folder that you didn't send yourself, we suggest taking the following measures to ensure the security of your account.

1. Log in to your Yahoo! Mail account.
2. Click "My Account" at the top of the page.
3. Enter your current password when prompted.
4. Click "Change Password" under Personal information.
5. Complete the form and click Save to make your changes.

• Be creative. Don't use words that can be found in a dictionary.
• Use at least eight characters.
• Don't use a password that you've used elsewhere.
• Don't use keyboard patterns (asdf) or sequential numbers (1234).
• Create an acronym. Don't use a common one, like NASA or SCUBA. Combine your acronym with numbers and punctuation marks.
• Include punctuation marks.
• Mix capital letters, lowercase letters, and numbers.
• Include character substitutions, such as the number zero for the letter 'O' or $ for the letter 'S.'
• Don't make your password all numbers, uppercase letters or lowercase letters.
• Find ways of getting random letters and numbers such as opening books, looking at license plates or taking the third letter from the first ten words you see.
• Don't use repeating characters (aa11).
• Don't use a password that is listed as an example of how to pick a good password.