Dealing with daily emails on Apple Watch is probably low on the list of things you want to do with the wrist-worn device, especially since you can't actually write or respond to emails in the Apple Watch Mail app. However, Mail can be a useful way to clean out your inbox without pulling out your iPhone. Plus, if you need to address an email right away, you can always use Handoff with your iPhone or Mac.
We've got some basics for how to use the Mail app on Apple Watch, plus some useful tips on customizing the app to suit your on-the-go needs.
Reading Email
If you are out and about and want to know if that email you have been waiting for has finally shown up, you can use Apple Watch to help you out. Mail for Apple Watch supports data detectors, so you can tap on phone numbers or addresses to automatically launch the appropriate app right from an email, a convenient feature when you're out and about.
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Article Link: How to Use the Mail App on Apple Watch