You can see what devices are logged into your Yahoo Mail account by logging in to your Yahoo Mail account and going to Settings. You can then click on Account Info and then select Devices.
If you are using a Yahoo account, it is possible to find out if someone else has accessed your email. You can go to the Security tab of your account settings page on the Yahoo website and click on the “Require login for all devices” option under “Security.” This will require that you enter your password every time you use a new device to access your account.
Yahoo does not allow users to see who has logged into their account. If you believe someone has logged in and accessed your account, you should contact Yahoo customer support for assistance.
If you suspect someone has attempted to log into your Yahoo account, change your password immediately. If you did not initiate the login process and cannot remember your Yahoo account password, then contact Yahoo and they will be able to reset it for you.
To log out of all devices, you just need to log out of the device you’re currently on. To do this, go to your account settings and select “Sign Out.
Yahoo Mail users can remove third-party apps from their accounts by going to Settings > Account Info > Manage Apps. From there, they can click on the app and select Remove.
