So long as you hit “undo” within 30 seconds of hitting “send”, though.
The “undo send” feature works by delaying the sending of an email for a pre-set amount of time, between five and 30 seconds, after a user hits “send.” During that period, users can click a link to undo sending the email and fix just-noticed typos, insert forgotten attachments, or narrowly avoid the dreaded faux pas of the accidental “reply all.”
@ug_o @lordbanks double post on same topic…great minds think alike. Admin should probably merge the topics
Today, I learnt Google had added this ‘Undo’ feature to enable users rollback messages that have been sent.
My colleague and I, at work, have tested the feature to see how it works—and its limits [see screenshots below]:
How it works:
You compose a message, send it…then click ‘Undo’. Simple.
One thing to note, however, is the time gap available before the message is finally sent. We timed it to see if the message will just keeping hanging while prompting you to undo: we saw that after 20 seconds, the system will proceed to send.
The use cases I see it being of significance would be when you mistakenly click ‘Send’, and when you forgot to include something in your message. I’m sure lots of people will find this feature very useful.
Merged, thanks.
I moved a post to an existing topic: You can now undo your Gmail indiscretions
It’s been merged. Thanks, @remi, for pointing that out.
This has been available in Gmail Labs for a few years now. I’ve had it for so long that I was surprised to see it making the news. 
Because you are obviously one of those bleeding edge beta testers. It’s only just become a standard Gmail feature, for the rest of us muggles.
I came across this some days ago http://www.businessinsider.com/criptext-secure-email-platform-raises-500000-2015-6
same here! Feels like it’s been around for ages. I actually thought it was an improvement or something close to the Almighty Recall feature on outlook.
Woulda sworn you were a Gmail Lab rat… I’ve also had this for quite a while now… about 18 months or so…
You should experiment with the features in Gmail Lab some more
