In Gmail go to Settings > General > Undo Send... you can set it to 5-30 seconds..
Nice convenient feature....
Feature may not be available for all Gmail users just yet...
This feature has been in Outlook and AOL more than 6 years ago.
Better late than never and we welcome it
Back then Gmail offered
It was called send after and you get the option to select the minutes when you click send how long it takes to send it off so you can cancel if necessary.
The Real Unsend feature is available for web gmail, and mobile app Inbox
This will not work for gmail app on mobile devices, well no announce about it so far.
Hopefully they implement it within Gmail app
Currently: HP Touchsmart 14t
SM-G935FD - S7 Edge dual sim: Android 7 Official
The 3 C's in life: Choice, Chance, Change. You must make the Choice, to take the Chance, if you want anything in life to Change.
Its good to know its now official and I can actually select the wait time, been using it for a few months now, very useful.
Still waiting on them to implement the ability to send email on a specific date and time in the future.