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darkfeline couldn't unsend this Ars Technica article:

Google's Gmail has graduated an unsend email option that had existed in the "Labs" section of the settings for years:

With the option, Gmailers get the chance to click an "undo send" link at the top of the screen after clicking "send" on any e-mail message. As with the original Labs version, the option, which now lives in the service's "general" settings tab, lets users pick a safety timespan between 5-30 seconds. Messages won't actually send until that time runs out, unless a user clicks the "view message" tab next to "undo," at which point a message will immediately whisk through the Internet's many tubes and reach its recipient.

The six-year-old option, which won't be turned on for the general public by default, had previously lived in Gmail's Labs tab, so if users wanted to enable it, they had to bypass a stark warning about "experimental" features that could "change, break, or disappear at any time." Major competitors like Hotmail and Yahoo Mail have yet to offer a similar option.