After 'undo', technology giant Google has now introduced 'block' and 'unsubscribe' features for its Gmail service that will allow users to block email IDs and unsubscribe from newsletters with a few clicks.<br />"In addition, the unsubscribe option is now making its way to Android, so you'll be able to opt out of eligible mailing lists directly from the Gmail app.<br />In June, Google had introduced the 'Undo' option that allows users to cancel delivery of an email within 30 seconds of hitting the send button, helping them avoid misdirected or inappropriate emails.
