Mailing cancellation feature of Gmail is Officially activated, "You have 30 seconds maximum to think"

Unde Send the Gmail features has been officially launched after a long time trial. You can cancel your email within 30 paper 5,10,20 or after you press the send button. And the message for the past long time can not be canceled. This feature is applied on the web, so you can not use this feature if you use your phone or another device.
Enable Gmail Undo Send to how

First, to enable the Undo Send, you visit Gmail.com and login to your Gmail  account
Then, you click once on the gear icon> Settings> General tab> Enable Undo Send. You choose the time to cancel longevity of email, select 30 seconds to be sure. And click once on save changes.
Next, you compose messages in Gmail on the Web -based and clicking the submit button, a dialog box appears at the top of the page with the Undo button. After you pick the time, this dialog box will automatically disappear
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