How to unsend an email in Gmail, Outlook and Apple Mail

There's a specific two seconds after you click send, when your eyes go back to the screen and you read the thing you just did: the wrong name in the To line, the price off by a decimal, the attachment you swore you'd added.

So: can you unsend it? Usually not, and the honest version of the answer matters more than the click path. What Gmail, Apple Mail, Proton Mail and Outlook.com call "unsend" isn't a recall at all. It's a delay. Your provider holds the message for a few seconds before it goes anywhere, and clicking Undo during that window means the message never actually left. Once the window closes, it's on the recipient's server and nothing you do in your own mailbox touches it.

The one real exception is Microsoft 365 message recall, and it's narrower than the internet thinks in some ways and much broader in others. Most pages ranking for this question still repeat a rule that Microsoft's own documentation has retracted in writing.

Here's what each platform actually does, where the limits are, and what to do in the far more common case where the window is already gone.

Can you unsend an email? The short answer per platform

Unsend and recall are two different mechanisms. Unsend is a delay: your provider holds the message for a few seconds, and clicking Undo means it never goes out at all. Recall is a deletion after the fact: the message was delivered, and the system then removes it from the recipient's mailbox. Almost every platform gives you the first one. Only a Microsoft 365 work or school account gives you the second, and only for recipients inside your own organization.

Every cell here comes from the platform's own documentation, linked in the sections below.

Two things fall out of that table. The longest window on the list belongs to Outlook for Mac at two minutes, not to Gmail's much-quoted 30 seconds. And only one row is a genuine recall, which is the row most people aren't in.

How to unsend an email in Gmail

Right after you send, Gmail shows "Message sent" with an Undo link in the bottom left. Click it and the message reopens as a draft. Google's documentation puts it plainly: right after you send a message, you can retract it.

To change how long you get, on the web:

1. Open Gmail and click the gear icon at the top right.
2. Click See all settings.
3. On the General tab, find Undo Send.
4. Next to it, select a send cancellation period of 5, 10, 20 or 30 seconds.
5. Scroll down and click Save Changes.

Those four values are the whole menu. There's no 60-second option, whatever you may have read: 30 seconds is the documented maximum.

On Android and on iPhone, Gmail shows "Sent" with an Undo option in the bar at the bottom of the screen. Google's mobile help pages don't publish a cancellation period for the mobile apps and don't offer the setting there. The account-level control is a web setting, so if you want the longest possible window, go set it on a computer once and it applies to the account.

The appeal of the delay model is that nothing was sent: nobody was notified and there's no trace of it in the recipient's mailbox. That's also where it stops. Thirty seconds after the fact, Gmail has no mechanism to reach into someone else's inbox, and no consumer Gmail feature will give you one.

How to unsend an email in Outlook

Before the click path, two questions decide which mechanism you even have:

Which Outlook are you in? There are now five of them (classic Outlook for Windows, new Outlook for Windows, Outlook on the web, Outlook for Mac and the mobile apps) and they don't behave the same. If you're not sure which one you're looking at, we walk through telling them apart on the page about the Bcc field, where the same question comes up.

Is your address a work account or a personal one? This is the one that matters. Message recall only exists on a Microsoft 365 work or school account. Microsoft states it directly: recall isn't available for addresses ending in @outlook.com, @hotmail.com, @live.com or @msn.com. On those, what you get is the delay, same as Gmail.

Undo send in Outlook.com and Outlook on the web. Go to Settings > Mail > Compose and reply, turn on the undo send option, and set a delay of up to 30 seconds. Outlook then holds the message so you can cancel it if you change your mind.

Undo send in Outlook for Mac. Go to Outlook > Settings > Composing and set the delay time: 5, 10, 15, up to 120 seconds. That's the longest undo window documented on any platform in this article, and it's available on Microsoft 365 subscription licenses and Outlook.com accounts.

Recall on a work or school account. Open your Sent Items, open the message (double-click it so it opens in its own window), and use the Recall this message action. Then you wait for the report, which is the part worth understanding.

Microsoft answers the question of which clients can do this twice, and differently. The consumer help page lists classic Outlook for Windows, new Outlook for Windows and Outlook on the web. The Exchange documentation, which describes the current mechanism, lists two more: "you can trigger Message Recall in the Classic Outlook, New Outlook, Outlook for Mac, Outlook on the Web, and Outlook for Android/iOS". So if you're on a Mac or on your phone with a work account, try it. The page telling you that you can't is the same page that still carries the retracted rule below.

What Outlook's message recall actually does, and the rule most pages still get wrong

Most pages you'll find on this question say recall only works if the recipient hasn't opened the message yet. Microsoft's own Exchange documentation retracts that, in one sentence, verbatim:

The message recall dialog in Outlook states that only unread messages are recalled. This statement is no longer accurate.

Cloud-based message recall doesn't ask the recipient's copy of Outlook to cooperate. A feature agent in Exchange Online intercepts the recall request and hard-deletes the original from recipient mailboxes. Whether the message was read no longer decides anything. What decides it is a setting your administrator controls: RecallReadMessagesEnabled determines whether already-read messages get pulled back, and MessageRecallEnabled determines whether any of this is switched on in your tenant at all. That's why the same click path works for a colleague and does nothing for you.

Microsoft's own consumer-facing help page still carries the old "hasn't opened the message yet" condition. The two pages disagree, and if you go looking you'll find both. The Exchange documentation is the one describing the current mechanism.

Four more things a practitioner should know before reading a recall report:

• The recall request never shows in your Sent Items. It's moved straight to the Purges folder under Recoverable Items. If you go looking for evidence that you tried, you won't find it there.
• The system keeps trying for up to 24 hours. A recipient whose mailbox is unreachable right now can still have the message pulled later.
• The report comes from Office365Reports@microsoft.com, with the subject "Message Recall Report" and the original subject line. Read it before you assume anything. It's the only thing that tells you what actually happened.
• In message trace, the status reads Failed even when the recall worked. The recall message gets dropped once it's done its job, and the trace records that drop. Don't panic at it, and don't let it talk you out of checking the actual report.

One thing to be careful about, because the rest of the internet isn't: what the recipient sees. Neither of Microsoft's two pages documents what the recipient experiences when a cloud-based recall runs. Pages that tell you confidently that they'll see a "recall attempt" notice, or that they'll see nothing at all, are guessing in one direction or the other. What you can verify is the report. That's what to go on.

Why your Outlook recall is not working

If you're searching for why your recall didn't work, it's almost certainly one of these. All of them are documented:

• The recipient is outside your organization. Recall only works inside one organization. You can't recall messages over the internet or across organizations. This is the single most common reason, and it has no workaround.
• Hybrid setup, recipient on on-premises Exchange. Messages sent from a cloud mailbox to an on-premises mailbox can't be recalled.
• Personal address. @outlook.com, @hotmail.com, @live.com and @msn.com accounts don't have the feature.
• The message got forwarded. Auto-forwarded to another mailbox inside the same organization: still recallable. Auto-forwarded outside the organization: not. Forwarded manually by the recipient: not. Forwarded by an inbox rule, either forward or redirect: not.
• Outlook for Windows is in Online mode, or the profile has multiple Exchange accounts configured. Recall doesn't work in either case.

If you're in one of those situations, there's no setting that fixes it. The message is delivered and it stays delivered, which brings us to the case most people are actually in.

Sent an email you can't unsend? What to do now

This is the real question behind most searches for how to unsend an email, and it's the part the platform docs never cover, because it isn't a feature.

First, sort out what actually went wrong, because the three failures have different repairs.

Wrong recipient, sensitive content. This is the only one that's genuinely urgent, and speed beats polish. Write to the person who got it, in minutes rather than hours, and make the ask specific. A vague "please disregard" gets ignored; a specific instruction usually gets followed:

Subject: Please delete my last email

Hi Sam, I sent you a message a few minutes ago that was meant for someone else, and it has a contract attached that isn't yours to see. Could you delete it without opening the attachment, and not forward it on? Sorry for the noise, and thanks.

If the content was regulated or covers somebody else's personal data, tell whoever owns that risk at your company on the same day, and don't wait to see if anything comes of it.

Wrong content, right person. Send the correction as a reply on the same thread, and quote the specific thing that was wrong rather than gesturing at it:

Correction to my last message: the renewal price I gave you was $400. It's $440. Sorry about that, the rest of the quote stands.

Somebody reads that thread six months from now, possibly the customer's finance team, and it should be self-explanatory without them having to reconstruct which sentence you meant.

Missing attachment. Just send it, with a three-word lead-in and no ceremony:

Attaching it properly this time.

Nobody needs an apology for this one, and a paragraph of contrition draws more attention to it than the file does.

Those are repairs, not apologies. If what you owe is a genuine apology, because the mistake cost the customer something, what the follow-up should actually say is its own craft and we've written it up separately.

One thing that catches people out: deleting the message from your own Sent folder does nothing. It doesn't touch the copy in their mailbox. Their copy was delivered to their server and it belongs to them now. All you've done is destroy your own record of what you sent, which you'll want later if there's any dispute about it.

Can you unsend an email in Apple Mail, Proton Mail or Yahoo Mail?

Apple Mail

On iPhone you get 10 seconds to change your mind after sending. Tap Undo Send at the top of the inbox to pull the message back. To change the delay, go to Settings > Apps > Mail, tap Undo Send Delay, and choose a length of time. Apple doesn't publish the available values or a maximum on its user guide page, so treat 10 seconds as the number you know and the rest as whatever the picker offers you.

Proton Mail

Undo Send is on by default with a 10-second timer, and it's configurable between 0 and 20 seconds, where 0 turns it off. On the web it's at Settings > All settings > Messages and composing > Composing > Undo send; on mobile it's Settings > Mailbox preferences > Undo send. Undo on the web reopens the message in the composer; on mobile it goes back to Drafts.

Yahoo Mail

There's no unsend and no recall. Yahoo says so itself, in one sentence: it's not possible to recall an email that's been sent in Yahoo Mail. Their suggestion is to save a draft and reread it before sending, which tells you how much of a safety net you have here.

Unsending from a shared mailbox is a different problem

If the message went out from a shared support address rather than your own, two things change.

The mechanics first. You can recall a message sent from a shared or delegated mailbox, but the report isn't viewable by the person connected to that mailbox. Seeing it requires authenticating as the owning mailbox, and you can't sign in as a shared account. So you can fire the recall and then have no way to see whether it worked. There's also a specific dead end: in Outlook on the web, with an automapped shared mailbox, the Recall option is grayed out when you try it from the shared mailbox's Sent Items. (Automapping, and what it does to a shared mailbox in general, is covered in the shared mailbox setup guide.)

The bigger problem is the one no setting addresses. On a shared address, the message you want back is rarely a typo. It's usually a reply that went out on behalf of the whole team, promising something the team hadn't agreed to, or answering a customer another person was already halfway through answering. Thirty seconds of undo is the wrong tool for that, because the person who needed to catch it isn't the person who clicked send.

What actually helps is structural: one owner per conversation so two people aren't drafting at once, and drafts that are visible to the team before they go rather than after. That's the job a shared inbox does, and it's what a tool like TriageFlow is for. If you're running a shared address on Gmail today, the routes and their limits are covered in running a shared address in Gmail.

How to extend your undo send window, and stop needing it

Prevention here comes down to four settings rather than any change of habit.

Set the longest window your platform gives you. Most people leave the default. Gmail's is 5 seconds and the maximum is 30; Outlook for Mac goes to 120. Take two minutes and change it once.

Defer everything, if you're a repeat offender. In classic Outlook for Windows you can build a rule that defers delivery of every outgoing message by a number of minutes, and delivery can be delayed up to 120 minutes. Two hours of grace on everything you send is a far bigger safety net than any undo button, at the cost of your mail not being instant.

Use schedule send deliberately. In Gmail, the arrow next to Send lets you pick a time. Three documented details worth having: you can have up to 100 scheduled emails, cancelling a scheduled email turns it back into a draft, and scheduled mail may be sent a few minutes after the scheduled time, so don't use it for anything that has to land on the exact minute.

Know what confidential mode can and can't do. Gmail's confidential mode is the closest thing a consumer Gmail user has to a real recall: open the message in Sent and click Remove access, and the recipient can no longer open it, at any point after sending. Google ships a caveat with it, and it matters:

While confidential mode can help prevent recipients from accidentally sharing emails, they can still take screenshots or photos of your emails. Recipients with malicious programs may still be able to copy or download your messages.

So it controls access, not knowledge. If somebody has already read the thing, removing access doesn't unread it.

A word on the admin route, since somebody always asks. Google Workspace administrators can delete messages from users' mailboxes using the security investigation tool. But that tool requires Frontline Standard or Plus, Enterprise Standard or Plus, Education Standard or Plus, Enterprise Essentials Plus, or Cloud Identity Premium. If you're a five-person team on Business Starter, that door is closed, and the actions only apply within Gmail anyway.

The replies that go out wrong are usually the ones typed fastest, under pressure, on the tenth similar question that morning. For the ones you send constantly, having canned responses written calmly in advance removes most of the opportunity to get it wrong.

Frequently asked questions

Can you unsend an email after an hour?

On Gmail, Apple Mail, Proton Mail, Outlook.com and Yahoo Mail: no. Those undo windows are measured in seconds and the message left your provider almost immediately. The exception is a Microsoft 365 work or school account, where recall keeps trying for up to 24 hours, but only for recipients inside your own organization.

Can you recall an email that has already been read?

In Microsoft 365, yes, if your administrator allows it. Microsoft's Exchange documentation explicitly retracts the old "unread messages only" rule that the Outlook dialog still displays and that most articles still repeat. Whether it applies to your tenant depends on the RecallReadMessagesEnabled setting.

Does the recipient know you unsent an email?

If you caught it in an undo window, there's nothing to know: the message never left your provider. For a Microsoft 365 recall, Microsoft doesn't document what the recipient sees, so anyone telling you confidently either way is guessing. Go by the recall report you receive rather than by what you hope happened.

Can you unsend an email after a day?

No. Every undo window in this article is measured in seconds, and a Microsoft 365 recall stops retrying after 24 hours, so by the next day even that has given up. At this distance the message has been sitting in their mailbox overnight and has very likely been read, which makes it a conversation rather than a technical problem. Send the correction on the original thread so the two live together.

How do I unsend an email on my iPhone?

Depends which app. In Apple's Mail app you get 10 seconds and tap Undo Send at the top of the inbox. In the Gmail app you tap Undo in the bar at the bottom right after sending, though Google doesn't publish how long that window lasts on mobile.

What do I do if I sent an email to the wrong person?

Write to them directly within minutes and ask for something specific, like deleting it without opening the attachment, rather than a vague request to disregard it. Then tell whoever owns data risk at your company if the content warranted it. Deleting your own copy from Sent Items changes nothing on their end.