You have just sent an email and immediately spotted a mistake. Perhaps you forgot an attachment or sent it to the wrong person. This is a common situation in fast-paced work environments. Outlook includes a feature called Undo Send that can recall a message for a brief period after you click Send. This article provides the steps to enable and use this feature to cancel a sent email.
Key Takeaways: Using the Undo Send Feature
- File > Options > Mail > Undo Send: This menu path is where you enable the feature and set the recall delay period.
- Undo button in the message bar: After sending, a notification appears at the top of your inbox with an Undo link for a few seconds.
- Keyboard shortcut Ctrl+Z: You can press this key combination immediately after sending to trigger the recall if the notification is visible.
Understanding the Undo Send Feature
The Undo Send feature does not actually pull an email back from the recipient’s server. Instead, it creates a short delay before Outlook releases the message from your Outbox. During this configured delay, the message stays in your Outbox folder. The Undo action simply deletes it from there before it is transmitted. This means the feature only works if you are using Outlook in a configuration where it handles sending, such as with a Microsoft 365, Exchange, or POP/IMAP account.
You must enable Undo Send before you can use it. It is not active by default. The most critical setting is the recall period, which you can set between 0 and 120 seconds. A typical setting is 10 seconds, giving you enough time to notice an error but not so long that it disrupts your workflow. The feature works in the Outlook desktop application for Windows and Mac, and in the web version at Outlook.com or the Microsoft 365 portal.
Steps to Enable and Use Undo Send
Follow these steps to turn on the feature and cancel a sent message.
- Open Outlook Options
In the Outlook desktop app, click the File tab in the top-left corner to open the Backstage view. Then select Options from the list on the left side. - Navigate to Mail Settings
In the Outlook Options window, click the Mail category in the left-hand pane. This will display all mail-related settings. - Locate the Undo Send Setting
Scroll down within the Mail settings until you find the section labeled “Send messages.” Look for the option “Undo send” and check the box next to it. - Set the Recall Delay Period
Use the dropdown menu next to the Undo send option to select your preferred delay. Choose a time like 10 seconds. Click OK to save and close the Options window. - Send an Email and Use Undo
Compose and send an email as you normally would. Immediately after clicking Send, a small notification bar will appear at the top of your main Outlook window. It will say “Undo” and show a countdown. Click the Undo link in that bar before the timer expires to cancel the send.
Using the Keyboard Shortcut
When the Undo notification bar is visible, you can also press Ctrl+Z on your keyboard. This performs the same action as clicking the Undo link. The shortcut must be pressed while the notification is on screen.
Common Mistakes and Limitations to Avoid
Undo Send Option is Grayed Out or Missing
If you cannot find the Undo Send setting, you may be using an older version of Outlook that does not support it, such as Outlook 2010 or earlier. The feature requires Outlook 2013 or newer. Also, verify you are looking in the correct account settings. For some account types in older configurations, the option may not be available.
The Undo Notification Does Not Appear
The notification bar only appears in the main Outlook window, not in a separate compose window. If you have the reading pane disabled or are focused on a different folder, you might miss it. Ensure your view is on the Mail module and your Inbox is selected after sending. The feature also will not work if Outlook is set to send messages immediately when you press Enter.
Message Was Already Transmitted
Undo Send has a strict time limit. If you set the delay to 5 seconds and act after 6 seconds, the recall will fail. The message has already left your Outbox. The feature cannot retrieve an email from a recipient’s inbox. It is only effective during the brief holding period on your local machine or within your mail server’s outbound queue.
Undo Send vs. Message Recall: Key Differences
| Item | Undo Send | Message Recall |
|---|---|---|
| Primary Function | Delays sending for a few seconds to allow cancellation | Attempts to delete or replace an already delivered email |
| When It Works | Only during the configured delay period after clicking Send | After sending, requires recipient to use Outlook and have not read the message |
| Success Rate | Very high if acted upon quickly | Often low, depends on recipient’s email client and settings |
| User Control | Fully controlled by the sender | Depends on recipient’s client and actions |
| Best For | Catching typos, wrong recipients, or missing attachments immediately | Formal retractions of sensitive information sent to internal colleagues |
You can now prevent many common email mistakes with the Undo Send feature. Enable it and set a practical delay like 10 seconds in your Outlook settings. For more control over sent items, explore creating mail rules to delay all messages by a minute. A related advanced tip is to use the Outlook mobile app, which also supports Undo Send for messages sent from your phone.