"Users can recall e-mails from a recipient's inbox, cause a message to self-destruct after a certain number of reads or after a set period of time. BigString converts the e-mail to what is basically a simple Web page (an HTML document) and stores it on their server. When you change or delete the documents or attachments, you are not actually breaking into the recipient's inbox, but changing the virtual string that goes from BigString's server to that inbox."
Interesting idea. Wonder what the FSA would have to say about it?