Oops, hit “Send” too soon? or send to the wrong person. what can i do now? don’t worry ! Google Gmail Labs giving you the solution for Recall or Undo send. from this facility you can stop messages from being sent for a few seconds after hitting the send button. Goggle gmail labs named this feature as “Undo send”.
Follow these steps to enable this service
Login to Gmail > Settings > Labs > Undo send > Enable
After enabling “Undo send” facility you can recall the messages after sending please note you can recall messages within few seconds (default 5 seconds but can customize up to 10 seconds from general settings). after the given time you can’t recall that mail.
so many new features available like this in google gmail labs. this is not for the known few but for the known majority.