Securing Yahoo! Mail

Data and email security Yahoo refers to its version of two-factor authentication as “second sign-in verification”. You can enable and configure it by clicking on:

Account Info

and security

set up your second sign-in verification.

Yahoo only uses SMS for sending its 2SV codes.

If you use mail client software such as outlook or mail app on mobile devices, these can’t usually handle more than one password so you may need to make an app-specific password.

I used did this for my wife’s iPhone. The iOS mail now prompts you for your SMS verification code. Making things even easier than ever.