For more than a year now, Gmail has allowed you to undo the sending of an email. However, this feature was only available when you use Gmail in a browser, not in the Gmail mobile apps. Now, an “Undo” button is finally available in Gmail for iOS.
Gmail for the web allows you to set the time limit for the Undo button to 5, 10, 20, or 30 seconds, but the Undo button in Gmail for iOS is set to a time limit of 5 seconds, with no way to change that.
NOTE: You have to be using least version 5.0.3 of the Gmail app for iOS to have access to the Undo button, so make sure you check if the app needs updating before continuing.
Open the Gmail app on your iPhone or iPad and tap the new message button at the bottom of the screen.
Compose your message and tap the Send button at the top.
Oops! I’m sending it to the wrong person! A dark gray bar displays at the bottom of the screen saying your email was sent. That can be misleading. Gmail for iOS now waits 5 seconds before actually sending the email, giving you a chance to change your mind. Notice that there’s an Undo button on the right side of that dark gray bar. Tap “Undo” to prevent that email from being sent. Be sure you do so quickly since you only have 5 seconds.
An “Undoing” message displays on the dark gray bar…
…and you are returned to the email draft so you can make any changes you need to make before really sending the email. If you want to fix the email message later, tap the left arrow in the upper-left corner of the screen.
Gmail automatically saves the email as a draft available in the Drafts folder in your account. If you don’t want to save the email, tap Discard on the right side of the dark gray bar within a few seconds to delete the email draft.
The Undo Send feature in Gmail for iOS is always available, unlike in Gmail for the web. So, if you have the Undo Send feature off in your Gmail account for the web, it will still be available in the same Gmail account on your iPhone and iPad.