How to Unsend an Email in Gmail, Outlook & Apple Mail
Hit send too soon? You usually have a few seconds to take it back. Here is how to unsend an email in Gmail, Outlook, and Apple Mail — and how to stop needing to.
You can only unsend an email during a short undo-send window (5–30 seconds), and only before it is delivered. Set the longest window your app allows. After that, the message is gone — so the real fix is reviewing before you send.
The honest truth about “unsending”
There’s no magic button that pulls an email back out of someone’s inbox. What Gmail, Outlook, and Apple Mail actually give you is a brief delay before the message is sent — a few seconds where “Undo” cancels it. Miss that window and the email has been delivered. So speed matters.
How to unsend an email in Gmail
- Send your email as normal.
- An “Undo” prompt appears at the bottom-left for a few seconds. Click it to pull the message back into a draft.
- To extend the window: Settings → See all settings → General → Undo Send, then pick 5, 10, 20, or 30 seconds. Choose 30.
How to unsend an email in Outlook
There are two different cases, and they behave very differently:
- Outlook.com / new Outlook: turn on an undo-send delay under Settings → Mail → Compose and reply → Undo send (up to 10 seconds), then click Undo right after sending.
- Classic Outlook on Exchange: open the sent message → File → Resend or Recall → Recall This Message. Recall only works inside the same organization, only if the recipient hasn’t opened it, and it often fails — treat it as a long shot, not a guarantee.
How to unsend an email in Apple Mail
- After sending, an “Undo Send” option appears at the bottom of the mailbox list for about 10 seconds.
- Tap or click it to bring the message back as a draft.
- Adjust the delay on iPhone under Settings → Apps → Mail → Undo Send Delay.
The better fix: don’t send the wrong email
Undo-send is a safety net measured in seconds. The real cause of the panic is sending before you’ve really looked — a typo, the wrong recipient, a reply-all that should’ve been a reply.
This is where an approval-first inbox helps. Tomorrow drafts replies for you but never sends on its own — every outbound message (AI-drafted or your own) waits for your review and approval first. The wrong email doesn’t need recalling, because it never leaves until you say so. And it works on any mailbox — Gmail, Outlook, Apple Mail, or a custom domain over IMAP.
Frequently asked questions
Can you actually unsend an email?
Sort of. Gmail, Outlook, and Apple Mail give you a short window — usually 5 to 30 seconds — to cancel a message before it actually leaves. After that window, the email has been delivered and cannot be truly unsent (Outlook on Exchange can attempt a recall, but it often fails).
How long do I have to unsend an email in Gmail?
By default, 5 seconds. You can extend it to 10, 20, or 30 seconds in Settings → See all settings → General → Undo Send.
Can you unsend an email after an hour?
No. The "undo send" window is seconds, not hours. Once a message is delivered to the recipient's server it is out of your control. Outlook within the same Exchange organization can try a recall, but it frequently does not work and the recipient may still see the original.
How do I avoid needing to unsend emails?
Slow down the moment of sending. A longer undo-send window helps, and an approval-first inbox like Tomorrow lets you review every outbound message — including AI-drafted ones — before it goes, so the wrong email never leaves in the first place.
Let Tomorrow write the email for you
Tomorrow is the AI inbox that works on any email address. It drafts replies in your voice, handles follow-ups, and waits for your approval before sending.
