I'm imagining opening an e-mail... marking it as unread because I'll want to read it later, and when I come back it's no longer there because I forgot to press

I'm imagining opening an e-mail... marking it as unread because I'll want to read it later, and when I come back it's no longer there because I forgot to press the "DO NOT SELF DESTRUCT!!!" button. I believe we have the exactly right amount of anoyance with spam, and familly relatives. Self destructing messages would be the last drop. :P