How to change the default email app on an iPhone

To change the default email app on an iPhone, you'll need to upgrade to iOS 14 and make sure you have a compatible app ...
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How to Change Default iPhone Apps for Calls, Messages, Email and More

Change default iPhone and iPad apps under Settings > Apps > Default Apps. Options include browsers, messaging, contactless apps, and autofill setups for password managers. You can't pick a new default ...