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Unsend email with Undo Send in Mail on iPhone
You can change your mind and unsend an email message in the Mail app . 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 message.
Tap Undo Send at the bottom of the Inbox to pull back the message.
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 > Apps > Mail, tap Undo Send Delay, then choose a length of time to delay outgoing email messages.