Whether it is G-Mail or Outlook, it is possible to undo sent emails. Moreover, without any updates or add-ons.
How to Activate the Undo Sent Email Feature?
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Undo Sent Email in G-Mail
It is quite simple to undo an email singapore phone number example sent via G-Mail. Thanks to this service offered by G-Mail, you can cancel emails that you have sent with the wrong attachment, to the wrong person or with incomplete content without being ready.
To do this, you first need to activate the feature to undo an email sent via G-Mail. This feature is defined as “Undo Send” on G-Mail.
To activate undo send:

IMAP Setup for iOS and Android
Your server settings should be as follows:
IMAP Setup for iOS and Android
Click the Save Account button:
IMAP Setup for iOS and Android
Tap on the account you added:
IMAP Setup for iOS and Android