Google 's new Gmail feature , `` Undo Send , '' lets users rescind messages . `` Mail Goggles '' can prevent users from sending drunk e-mails they may later regret . Comment: Since the Gmail Labs program began , the features have grown in popularity among users , Google officials said . Gmail is the third most popular e-mail service , with tens of millions of users .
Google 's new Gmail feature , `` Undo Send , '' lets users rescind messages . `` Mail Goggles '' can prevent users from sending drunk e-mails they may later regret . Comment: Gmail is the third most popular e-mail service , with tens of millions of users .