Gmail's Undo Send feature allows you to create a grace period for yourself. You can set it to give yourself up to 30 seconds to undo the sending of an email. I have it enabled in all of my personal and professional Gmail accounts including my school G Suite for Edu account.
Watch this short video to learn how to enable "undo send" in your Gmail account.
On a related note, here's how to make sure that you don't "reply all" unless it's absolutely necessary.