Accidentally pressed the ‘send’ button before finishing your mail body??! It’s okay if you’re using Gmail 🙂 ,because Gmail has an ‘undo’ option to the ‘send’ action.
How to activate the ‘undo’ send option?
Settings–>Labs; and enable ‘undo send’
Settings–>General; set the cancellation period
Now, once you hit the send button and the ‘your message has been sent’ pops up above your inbox, it’ll have an ‘undo’ option on its side. 🙂