http://internet.whatsnewonthenet.com/service-provides-emails-that-self-destruct-2013-11-16/ use wisely and only over tor or a vpn , to stay anonymous an heres the link to the service, give it a whirl https://secretink.co/
Some people I tested this on are getting the messages fine, but a few have reported the message was already destroyed before they read it. Makes me wonder, could these people have a backdoor that is copying the message before they read it?
they might have some sort of odd setup that previews the message wich counts as a read and hence selfdestructs the message not neccesarily a backdoor per se or simple user error as so often these kinds of cases are, try again