Your Yahoo! Mail account is as secure as your password for it—and more.
For Yahoo! checks not only the password when somebody—you, hopefully—attempts to log in to your account; it also looks at the location and computer whence the attempt is made. If one looks suspicious (say, a device you've never used before), Yahoo! Mail can require more than merely the password—if you have two-step authentication enabled.
Then, a second step is necessary to complete for logging in, either entering a code sent to your mobile phone or answering security questions. You can also turn off the latter and require mobile phone verification. The Yahoo! Mail account then is as secure as your password and access to your mobile.
Protect Your Yahoo! Mail Account with Two-Step Authentication
To add a second layer of authentication for suspicious log-in attempts (from a new country, for example) to your Yahoo! Mail account:
- Hover the mouse cursor over your name or icon in the top Yahoo! Mail navigation bar.
- Select Account Info from the menu that appears.
- If prompted:
- Type your Yahoo! Mail password under Password.
- Click Sign In.
- Follow the Set up your second sign-in verification link under Sign-In and Security.
- Make sure Check this box to turn on the second sign-in verification is checked under Further Protect Your Account.
- If you already have a mobile phone number associated with your account:
- Click Use Current Phone to use it for two-step authentication or
- click Use New Phone to use a different phone number.
- Note that the form on this page may not allow you to enter phone numbers in all countries to which Yahoo! can actually deliver verification codes. (You can add those mobile numbers on your account page; see below.)
- If you have not yet set up a mobile phone number or chose Use New Phone:
- Enter your phone number under Second Sign-In Verification Setup: Add Mobile Phone.
- Click Receive SMS.
- Type the verification code received at the number under Enter code :.
- The code is not case-sensitive.
- Click Verify Code.
- Choose Use only my mobile phone number for verification. under Your second sign-in verification is turned on. to require the use of SMS text message verification or Use either my security question or mobile phone number for verification. to allow two-step authentication with password and security question.
Add a Mobile Number Not Recognized on the Two-Step Verification Form to Your Yahoo! Mail Account
To set up a new mobile phone number for recovering access to Yahoo! Mail:
- Click your name or avatar in the top Yahoo! Mail navigation bar.
- Select Account Info from the menu that shows.
- Follow the Update password-reset info link under Sign-In and Security.
- Click Add another under Mobile Numbers.
- Enter your mobile phone number.
- Click the country code to pick a different one.
- Click Save.
(Updated May 2013)