You clicked send. and you think oops i sent the to wrong persone.. here is the easy way to solve this problem
When you send a no-take-backs email — maybe an admission to a secret crush, or accidental reply-all — there’s an instant pang of regret. It feels like there’s no going back.
Meet Gmail’s Undo Send feature, a lifesaving feature in the Gmail Labs settings. It gives you a 30-second window to “undo” sending an outgoing email.
You just have to enable it first.
Here’s how it works:
1. Click the gear icon in the top-right corner of your Gmail window and select Settings from the dropdown menu.
2. Select Labs from the row of tabs.
4. Hit Save Changes at the bottom.
5. Breathe easy.
It defaults so that you have 10 seconds to click before the Undo button disappears, but you can adjust that window of opportunity. Go to Settings > General > Undo Send, and select a cancellation period up to 30 seconds as seen in screenshot.