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Go to **Settings** by clicking the gear icon in the top right corner. Select **See all settings**. Under the **General** tab, find the **Undo Send** section and set the cancellation period (5, 10, 20, or 30 seconds). Click **Save Changes** at the bottom.
Compose your email as usual and click the **Send** button. You will see a message at the bottom left of the screen indicating that your email has been sent.
Immediately after sending, look for the **Undo** option that appears in the same bottom left corner. Click on **Undo** within the time frame you selected in the settings.
After clicking **Undo**, your email will be retrieved and opened back in the compose window. You can make edits or discard it entirely.
Ensure that the email is no longer in your **Sent** folder. If it is not there, the email has been successfully unsent.