Simply swipe the mail you've received and click on the "Remind Me" button.
Get reminders to follow up or come back to a mail
NEXT TIP
Unsend an email you just sent
When you've sent a mail you'll now get an "Undo Send" button at the bottom of your inbox.
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9 iOS 16 Features: Lock Screen Customization and Focus Filters
How to customize iOS 16 lock screen widgets, use Focus filters, edit messages, and lift photo subjects