How do I set Gmail undo send to 30 seconds?
On the web, open Settings, click See all settings, find Undo Send on the General tab and set the Send cancellation period to 30 seconds, then save. The options are 5, 10, 20 or 30 seconds, per Google's help page. After every send, a Message sent notice with Undo appears for that long. Click it and the email never leaves Gmail. There is no longer option, and Google's pages for the Android and iPhone apps describe only the Undo button, not the setting.
Change the cancellation period on the web
The setting is per account. If you use more than one Gmail account, set it in each one.
- 1Open Gmail on a computer and click the Settings gear at the top right.
- 2Click
See all settings. - 3On the
Generaltab, findUndo Send. - 4Next to
Send cancellation period, choose 30 seconds (the options are 5, 10, 20 and 30). - 5Scroll to the bottom and click
Save changes.
Undo a send on Android or iPhone
Google's help pages for the Android and iPhone apps describe only the Undo option after sending, not a setting to change the period inside the app. Set the period on the web.
- 1Send the email as normal from the Gmail app.
- 2Watch for the
Sentmessage at the bottom of the screen, which appears with anUndooption. - 3Tap
Undobefore it disappears. The email reopens as a draft.
What undo send actually does
Gmail does not retrieve anything. During the cancellation period the email has not been handed to the recipient's mail server at all; Gmail is simply waiting. Undo tells it to stop waiting and reopen the draft. This is why undo always works within the window and never works after it. Once the window closes the email is delivered like any other, and there is no Gmail feature that pulls a delivered email back from someone else's inbox.
Why it isn't working
When undo fails, it is almost always one of these.
- You looked away. The notice only shows for the length of your cancellation period. Set it to 30 seconds and the notice stays long enough to read your own subject line twice.
- You navigated away or closed the tab. The
Message sentnotice disappears when you leave the view, and with it theUndolink. - You expected a recall. After the window, the email is in the recipient's inbox. The only option is a follow-up correction, which is better sent quickly and plainly.
- You sent from a different client. iOS Mail, Outlook and other apps connected to your Gmail account have their own undo behaviour, or none. The 30-second setting only applies inside Gmail's own web app and apps.
- The email was scheduled. A scheduled send goes out at the chosen time without a
Message sentnotice in front of you, so undo does not apply. See how to schedule send in Gmail for what to check before scheduling.
30 seconds is a safety net, not a review
The habit that actually prevents wrong sends is a check before the click: recipients, attachment, the one sentence you are not sure about. Undo covers the moment of regret after the click. Both are worth having. If a tool drafts or sends on your behalf, the same two layers matter even more: a clear view of exactly what will go out, and a way to stop it immediately after.
The AI shortcut
Momo AI asks before it sends. Every email it prepares stops at a card showing the exact text and the recipients, chosen by code rather than by the AI, and nothing leaves until you tap. Sends from chat then get a 10-second undo of their own. Drafts it writes in your voice land in Gmail Drafts, where your normal Gmail undo send setting applies when you press Send yourself.
