This email by proxy system you want to build seems odd. With normal email, a recipient knows that someone intended to send them a message. If you were to add an

This email by proxy system you want to build seems odd. With normal email, a recipient knows that someone intended to send them a message. If you were to add an anonymous service in between, you would have the same setup except that the recipient would not know who the sender was. What you're talking about here adds another dimension on top of this basic anonymous scenario that doesn't make any sense to me. If I receive an email from an anonymous source that only had a 10% chance of delivery, how is this any different than if the email went through an anonymous mail system that had a 100% chance of being delivered?