The ability to unsend an email is a matter of adjusting one setting prior to writing your email. Retrieving an email sent in error will prevent you from having an embarrassing situation with Anil. This recall of a message will also allow you to modify spelling errors, incorrect recipients, subject line and even append forgotten attachments. Once you are satisfied with any editing, send the email on its way.
Try this and share the screenshot of Undo Send setting in the comment box below.
