In the Mail app
Messages are formatted to be viewed on your Apple Watch. Most text styles are preserved, and you can tap website links in Mail and view web-formatted content optimized for Apple Watch. Double-tap to zoom in on the content.
Website links aren’t available in all countries or regions.
Tip: You can make a call, open a map, or view web-formatted content from a mail message—just tap a phone number, address, or link.
When you receive a message you want to read on your iPhone, follow these steps:
Wake your iPhone.
On an iPhone with Face ID, swipe up from the bottom edge and pause to show the App Switcher. (On an iPhone with a Home button, double-click the Home button to show the App Switcher.)
Tap the button at the bottom of the screen to open Mail.