How to 'un-send' emails on Gmail

Who hasn't experienced that unique moment of dread that blossoms a moment or two after hitting send on an email - when you realise you've sent it to the wrong person?

Well, help is finally at hand. In its infinite wisdom, Google has implemented an "undo send" feature on its popular Gmail platform - giving people up to 30 seconds to make sure angry missives end up at the right place, or that they've spelled that cover letter right.

The undo send feature has actually been an experimental part of Gmail for years now, but it has been made official for the first time this week.

Of course, leave it any longer than 30 seconds, and no technology in the world can save you from the consequences of your actions...

Here's how to enable it:

• Click the cog icon in the top right

• Select "Settings"

• Scroll down to "Undo Send" and click "Enable"

• Set the cancellation period - how long you get to decide to unsend

• Click "Save Changes" at the bottom of the page

• Repent at leisure