Ive thought about an idea for an invention but not being in anyway an IT Guru i thought id put it on here for someone else comments and for them to invent and become millionaires. Say you send someone an email then decide later that you dont want them to recieve it, (maybe a druken rant or youve slept on it and changed your mind) when the recipitant are not connected to a network i assume the email sits on a mail server until they do, they then connect and they then recieve it. When the email is still sitting on the mail server if you could then send another email to the same person which deleted the firts one and bingo they never get the original first mail. Is such a thing possible/plausable/inventable or already in existance. I think its a good idea but like i say im not an IT man. Am i just showing my ignorance. Should i get my coat ?