The latest version of macOS allows you to set an email to be sent in the future and prevent an email from being sent in the first place.
The Apple Mail application has been improved with some new features in macOS Ventura, but there are two features that stand out: you can now schedule an email to be sent at a specific date and time, and if you accidentally sending, that message may stop before it is sent. Here’s how both features work.
What you need to schedule or undo an email
To use the new features in Mail, your Mac must be running macOS Ventura or later.
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To update an earlier version of macOS, click the Apple icon, select About This Mac, and then click the Software Update button. Click the Upgrade Now button to install the update.
Schedule an email on macOS Ventura
Open the Mail app, address and compose a new email. When you’re done, click the down arrow next to the Send Message icon at the top of the toolbar. The resulting menu offers three choices: Send now, Send at a specific time, and Send later. Click the second option to choose the suggested time. To choose a different day and time, click on the third option (Image A).
Image A

In the Send Later window, choose a specific day and time. When you are done, click the Schedule button (Figure B).
Figure B

After scheduling an email, a special Send Later folder will appear in the left pane as part of your mailbox. Click on the scheduled email to view it (Figure C).
Figure C

At this time, you cannot review or edit the email itself, but you can change the scheduled date and/or time.
Click the Edit button above the email to display the Send Later window. You can now change the date or time. When you are done, click the Schedule button (Figure D).
Figure D

When the scheduled time arrives, your email will be sent. To double check, look for it in the Sent folder (Figures E).
Figures E

How to undo an email on macOS Ventura
Apple describes the following function as undoing an email, but that’s not entirely accurate. With Apple’s Messages app, you can actually recall and replace a text that has already been sent and reached the recipient.
The Undo Mail option doesn’t work the same way. When you send an email in Apple’s Mail application, it doesn’t send immediately. By default, it waits 10 seconds before making the journey to the receiver. During those short seconds, you can unsend the message to prevent it from being sent.
To try this, compose and send an email. An Undo Send option appears at the bottom of the left pane. Click that option (Figure F).
Figure F

Your email will stop and appear on the screen for you to edit. Make the necessary changes and resubmit (Figure G).
Figure G

Want more than 10 seconds to prevent an email from being sent? Click the Mail menu and select Settings. In the Settings window, select the Compose icon. In the Send section, click the drop-down menu for Undo Send Delay and you can increase the delay time to 20 or 30 seconds (Figure H).
Figure H
