Gmail's Undo Send feature was kept in beta since 2009. This feature was developed by Google Labs for the past six years, as reported in ABC News. Last May 29, it became available through Inbox by Google and is now also availabe for web users using a browser.

According to Computerworld, Google has more than one reason for making this feature 100% accessible on its mail system.

The internet giant company takes advantage of the Undo Send feature to understand the pattern of Google email usage in the market. As the Undo Send becomes completely operational, Google observes the optional mail features used most, secondarily. This observation enables Google to better create and manufacture future online features that'll likely become viral in the market. Better business comes as Google is able to formulate apps in its mail system that'll attract more loyal customers.

The Hacker News published a step by step guide on how users can use Gmail's undo send:

1. Enable the feature by selecting settings on the cog icon at the upper right hand corner of your Gmail screen.

Once you send out an email and decide to either cancel or revise the content, users have a maximum of 30 seconds to cancel the outgoing message. Every time you send a message, a yellow dialogue box will appear saying, "Your message has been sent" along with an option to undo it.

2. Don't forget to click "Save Changes" at the bottom.

Once you tick the enable undo send box and select a cancellation period, do not forget to save the changes for the feature to work.

The undo send feature saves users from embarrassing situations when messages are sent to the wrong recipients or when you've mispelled a couple of words in your document. While this concept is somewhat similar to Outlook's recall feature, at least the recipient doesn't see you try to take back what you sent.