You can delete an email in Outlook, but only within a narrow window

Outlook has a feature called Undo Send that lets you delete a message after you hit send — but only for a few seconds, and only if you set it up first. The exact time window depends on your Outlook version and settings. Once that window closes, the email is in your recipient's inbox and cannot be recalled or deleted from their account.

If you are using Outlook on the web (Outlook.com or Outlook through your employer), you have a few extra seconds compared to the desktop version. If you are using the Outlook desktop app on Windows or Mac, the window is even shorter. Either way, the clock starts the moment you click Send, so you need to act when ready.

The recall feature that older versions of Outlook had — which could theoretically delete a message from someone else's inbox — no longer works reliably and should not be trusted. Most email systems ignore recall requests, and many recipients will see a notification that you tried to recall the message, which can draw more attention to the mistake.

Key Takeaways

  • Undo Send works only in the first 5 to 10 seconds after you click Send, depending on your Outlook version and settings.
  • You must enable Undo Send in your Outlook settings before you send the email — you cannot turn it on after the fact.
  • Once the undo window closes, the email is delivered and cannot be deleted from the recipient's inbox.
  • The old Recall feature does not work reliably and often alerts the recipient that you tried to delete the message.
  • The best protection is to pause before sending: use the draft folder, read the message aloud, and check the recipient line twice.

How to turn on Undo Send in Outlook on the web

Open Outlook.com or your work Outlook account in a web browser. In the top right corner, click the gear icon and select View all Outlook settings. On the left side, click Mail, then scroll down to find Undo Send.

You will see a dropdown menu that says "Send cancellation time limit (seconds)". The default is usually off. Click the dropdown and select how many seconds you want — typically 5 or 10 seconds. Click Save at the bottom of the page. The setting takes effect when ready.

Once this is on, every time you send an email, a bar will appear at the top of your inbox for a few seconds with an Undo button. Click it before the timer runs out and the email will not be sent. If you do nothing, the email sends normally after the countdown ends.

How to turn on Undo Send in Outlook desktop app

Open Outlook on your computer. Click File in the top left corner, then click Options (on Windows) or Preferences (on Mac). In the Options or Preferences window, click Mail on the left side.

Scroll down until you find Sending options or Send/Receive. Look for a checkbox that says Undo Send or Allow time for me to recall messages after sending. Check the box and set the time limit — usually 5 to 10 seconds. Click OK or Save.

The desktop version's undo window is shorter than the web version, often only 3 to 5 seconds. After you send an email, watch the bottom left corner of the window for an undo notification. Click it when ready if you need to stop the send.

What to do if the undo window has already closed

If more than a few seconds have passed, the email has been sent and cannot be unsent. At this point, your only option is to send a follow-up email to the recipient explaining the mistake and asking them to disregard the first message.

Be direct in the follow-up: write a subject line like "Disregard previous email" or "Please ignore my last message" so the recipient sees it when ready. Explain what was wrong with the first email — whether you sent it to the wrong person, included incorrect information, or made an embarrassing mistake. Keep the tone professional and brief.

Do not use the Recall feature unless you are in a corporate environment where your IT department has confirmed it works with your email system. In most cases, recall either fails silently or alerts the recipient that you tried to delete the message, which can make the situation worse.

How to prevent sending mistakes in the first place

The safest approach is to slow down before you hit Send. Write your email in the draft folder and leave it there for at least a minute. Read it aloud to catch typos and tone problems that your eyes might skip over. Check the recipient line twice — this is where most sending mistakes happen.

If you are sending to a group or a sensitive recipient, copy the email text into a plain text editor first, read it there without any formatting, and then paste it back. This breaks your automatic reading patterns and makes mistakes more visible.

Consider using the Delay Delivery feature in Outlook, which lets you schedule an email to send at a specific time rather than when ready. This gives you a longer window to catch mistakes. In Outlook on the web, click the dropdown arrow next to Send and select Schedule send. In the desktop app, right-click the email and select Delay Delivery.

Why Outlook's Recall feature no longer works

Older versions of Outlook had a Recall feature that attempted to delete a message from the recipient's inbox after it was sent. This feature relied on the recipient's email system cooperating with the recall request, which most modern email systems do not do.

Gmail, Yahoo Mail, and most corporate email systems straightforward ignore recall requests. Even when Outlook is set to use recall, the message stays in the recipient's inbox. Many email clients also send a notification to the recipient saying you tried to recall the message, which defeats the purpose and can draw attention to the mistake.

Microsoft has moved away from recall and toward Undo Send because it is more reliable — it works before the email leaves your computer, rather than trying to retrieve it after it has been delivered.

Frequently Asked Questions

Can I undo a send if I am using Outlook on my phone?

The Outlook mobile app for iPhone and Android does not have an Undo Send feature. If you need this functionality, use Outlook on the web through your phone's browser instead, where the feature is available. The web version works on mobile browsers and includes the undo window.

What if I sent an email to the wrong person?

If the undo window is still open, click Undo when ready. If it has closed, send a follow-up email to the correct recipient with the information they need, and send a separate email to the person who received it by mistake, asking them to disregard the first message and not share it. Be honest about the error.

Does Undo Send work if the recipient is offline?

Yes. Undo Send stops the email before it leaves your computer, so whether the recipient is online or offline does not matter. If you click Undo within the time window, the email will not be sent at all.

Can my employer see that I used Undo Send?

No. Undo Send cancels the send before the email enters your company's mail server, so there is no record of it being sent. Your IT department will not see an undone email in logs or backups.

Is there a way to extend the undo window beyond 10 seconds?

No. The maximum undo window in Outlook is 10 seconds on the web version and 5 seconds on the desktop app. If you need more time to review emails before they send, use the Delay Delivery feature instead, which lets you schedule a send time hours or days in the future.