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Unsend email with Undo Send in Mail on iPad
With the Mail app , you can change your mind and recall an email. You can also set a delay for all emails to give yourself a little more time to unsend them.
Undo a sent email
You have 10 seconds to change your mind after you send an email.
Tap Undo Send at the bottom of the email list to pull back the email.

Delay sending emails
You can give yourself a little more time to change your mind and unsend emails by setting a delay.
Go to Settings > Mail, tap Undo Send Delay, then choose a length of time to delay outgoing email messages.