How to Unsend an Email in Gmail (and Get More Time to Do It)

To unsend an email in Gmail, click Undo in the “Message sent” notice that pops up right after you hit Send (bottom-left on a computer, bottom of the screen in the Gmail app). You get 5 seconds by default, and you can stretch that to 30 seconds in Gmail’s settings on the web.

That’s the whole trick, but there are a few details worth knowing: how the window actually works, why the mobile apps behave differently, and what your options are once the Undo button is gone.

How Gmail’s Undo Send actually works

Undo Send doesn’t reach into someone else’s inbox and delete a message. Instead, Gmail simply waits a few seconds before it delivers your email. As Google’s own guide puts it, Gmail delays delivery to give you a chance to change your mind.

That has two practical consequences:

• If you click Undo in time, the recipient never receives anything. There’s no “this message was recalled” notice, because nothing was sent.
• Once the window closes, the message is gone for good. There is no official way to pull back a delivered Gmail message, whether it’s been 31 seconds or a week.

How to unsend an email in Gmail on a computer

1. Send your email as usual.
2. Look at the bottom-left corner of the screen. A “Message sent” notice appears with Undo and View message options.
3. Click Undo before the notice disappears.
4. Gmail reopens the message as a draft so you can fix it, add the missing attachment, or delete it.

If the notice has already disappeared, the cancellation period is over and the email has been sent.

How to extend the Undo Send window to 30 seconds

The default cancellation period is 5 seconds, which is easy to miss. You can raise it in Gmail on the web. According to the official Gmail Help page, the options are 5, 10, 20 or 30 seconds.

1. Open Gmail in a web browser on your computer.
2. Click the Settings gear icon in the top-right corner.
3. Click See all settings.
4. Stay on the General tab and find Undo Send.
5. Next to Send cancellation period, choose 5, 10, 20 or 30 seconds.
6. Scroll to the bottom of the page and click Save Changes.

For most people, 30 seconds is the sensible choice. The only cost is that every email you send from the web leaves your outbox a little later, which rarely matters in practice.

A note on conflicting information: at least one third-party blog post this year claimed the maximum had been raised to 60 seconds. We couldn’t find any confirmation of that from Google, and the official help page still lists 30 seconds as the longest option as of October 2026. If Google changes the options, the dropdown in your settings is the place to check.

How to unsend an email in the Gmail app (Android and iPhone)

The Gmail apps on Android and iPhone also support Undo Send:

1. Tap Send.
2. Watch the bottom of the screen for a bar that says “Sent” or “Sending” with an Undo button.
3. Tap Undo.
4. The email reopens as a draft, where you can edit or discard it.

Here’s where it gets less clear. Google’s help page lets you choose the cancellation period on a computer, but third-party guides including Proton’s walkthrough say the mobile apps don’t offer a setting to change it, and that the web setting doesn’t carry over to the apps. Sources also disagree on how long the mobile Undo bar stays visible, with estimates ranging from about 5 to 10 seconds. Google doesn’t publish a specific figure that we could find, so assume it’s short and tap fast.

If you often need more breathing room on your phone, two things help:

• Send important emails from the web, where your 30-second setting applies.
• Turn on “Confirm before sending” in the app’s settings if your version offers it, so you get a prompt before every send. It’s an extra tap each time, but it catches mistakes before the clock even starts.

Desktop vs. mobile at a glance

What to do if the Undo window has closed

Once the message is delivered, Gmail can’t recall it. Your realistic options are:

• Send a short follow-up. A brief correction (“Apologies, the attachment is now included” or “Please disregard my last email”) is usually the cleanest fix.
• Ask the recipient to delete it, if the email contained something sensitive or went to the wrong person.

Prevent it next time: Schedule send

If you’re writing something you want to review once more, schedule it instead of sending it right away. Per Google’s Schedule send help page, you can cancel a scheduled email before it goes out:

1. Open the Scheduled label in Gmail’s left sidebar (on mobile, tap Menu, then Scheduled).
2. Open the email you want to stop.
3. Click or tap Cancel send.

Cancelling doesn’t delete the message. It goes back to your Drafts, where you can edit it, reschedule it or delete it.

For sensitive emails: Confidential mode

Gmail’s confidential mode lets you set an expiration date on a message and revoke access later. To remove access on a computer, open Sent, open the confidential email and click Remove access.

This is not a true unsend, though. Google notes that confidential mode doesn’t stop recipients from taking screenshots or photos of your messages or attachments. And it only works if you chose confidential mode before sending; you can’t apply it to an email that’s already gone out.

Quick troubleshooting

• I didn’t see the Undo notice. On the web, it appears in the bottom-left corner and disappears when the cancellation period ends. If your period is set to 5 seconds, raise it to 30 so you have time to notice it.
• I changed the setting but the app still gives me only a few seconds. That’s expected based on current reports. The setting applies to Gmail on the web.
• I’m using Gmail through another app like Outlook. Undo Send is a Gmail feature, so it isn’t available when you send through a different email client.

Gmail’s settings and app layouts change from time to time, so menu names and positions may differ slightly from what’s described here. The details above are accurate as of October 2026.