How can I retrieve a never sent compose email?

I was composing an email but I accidentally pressed the back button and before I could finish or send the email I was sent to another page, how can I retrieve the email that was never saved or sent?

How can I retrieve a never sent compose email?
It is gone forever. You can save as a draft or send to trash and it will be there until you dispose of it. If you pressed the back button it is gone. (well not really, someone that really, really knows how to look at your hard disk would be able to retrieve it.)
Reply:click forward
Reply:Try hitting the foward button..it should take you back....but some browers dont save text so you might have to type it again