The I have too much time on my hands approach is to self-publish a short story to this person on how to get in touch with you and buy it from their amazon account.
Rather than go through self-publishing, you can use the personal documents service to upload a short document and send it down to the device. Details are at http://www.amazon.com/gp/help/customer/display.html/ref=hp_p.... There are fees if the user isn't on WiFi though...
This is brilliant. I would totally do that in a heartbeat. I don't know if I would have them buy it (although that might be necessary to get them to read it). You could presumably do the same thing with an app which ran and said, "Let's figure out what your real email address is shall we?"