Now, for those who have Gmail’s ‘Undo Send’ feature enabled (and head to Labs if you don’t), the ‘general’ tab under settings has been recently equipped with a drop-down menu, letting the regretful now cancel e-mails up to 30 seconds after they were initially sent. Although 30 seconds may seem paltry, it can be a lifesaver to those suddenly beset with sloth-related guilt. In the meantime, check this out.