The mailing feature in the Apple Watch is always limited. Apps like Gmail and Yahoo Mail are not available for Apple Watch. However, you can get Yahoo Mail notifications on Apple Watch.
The Apple Watch is yet to include mailing services. Even Apple’s own Mail is not available for Apple Watch. With the small screen, it won’t be feasible to access your emails on Apple Watch. If you still want to get the Yahoo emails on your watch, follow the below guide.
How to Get Yahoo Mail Notifications on Apple Watch
To get the Yahoo Mail notification on your watch, you need to configure the app on your iPhone.
 Make sure that your Apple Watch is paired with your iPhone.
 Then, install the Yahoo Mail app on your iPhone from the App Store.
 Launch the Yahoo Mail application on your iPhone and configure your account details.
 On the Yahoo Mail app’s home screen, click the Hamburger icon on the top left corner and click the Settings menu.
 Scroll down to choose the Notifications section.
 Make sure to turn on the Enable notifications toggle.
 Now, open your iPhone Settings and scroll down to choose the Notifications option.
 Ensure that Show Previews is set to Always.
 Scroll down to Yahoo Mail and select it.
 Ensure that notifications were allowed and banners were set to Temporary.
 Now, you will get Yahoo Mail notifications on your Watch whenever you receive a mail on your iPhone.
WatchMail for Yahoo Mail App
Update: The WatchMail app has been removed from the App Store.
WatchMail is a third-party mail app that is available on the Apple Watch. Using the WatchMail app, you can sign in with your Yahoo Mail and access all the emails directly on your Apple Watch. This is one of the possible ways to get Yahoo Mail on your watch. But, we don’t recommend this method as it involves third-party tools. These third-party tools can violate its terms and may endanger your mail. So, use these third-party apps at your own risk.
How to Turn off Yahoo Mail Notifications on Apple Watch
If you don’t want to receive Yahoo Mail notifications on your watch, you can turn off the Notification toggle on the iPhone. You can also change the notification sound on Apple Watch.
 On your iPhone, go to the Settings menu.
 Go to the Notification Menu and select the Yahoo Mail app.
 Turn off the Notification toggle. This will stop all the notifications from Yahoo Mail on your iPhone and Apple Watch.
Yes, apps like Microsoft Outlook and Zoho Mail are available for Apple Watch.