[dropcap]G[/dropcap]mail has finally upgraded their “Undo Send” feature from the email service.You can choose Undo Send The feature between 5, 10, 20 and 30 seconds.

Note:- Undo Send The feature is disabled by default.The “Undo Send” feature has been a part of Gmail Labs since 2009, but it’s just now getting the full-feature.

Google adds "Undo Send" feature to Gmail