I was concerned about this too when I set up OurDoings to accept photos by email. I don't let users pick their own address to send to; I generate a random one for them.

And yes, emailing to a frame is cool, but I'm biased because I'm doing it.

You can specify which emails are allowed to send pictures to your frame. We have some software that will filter out forged headers on emails as well. So far, it hasn't been a problem for us.

Ah that's cool. I'm just thinking of possible issues in the future. Giving one of these to a grandparent, and then them being emailed goatse etc would not be a good thing.