I applaud these goals however if we were to ever consider moving from Google Apps (which we would) it would only be for an open source project given that privacy is becoming the more critical issue as the years go on. It would be great to see a subscription based email service such as this where the source is fully available for scrutinizing and patching. Edit: Great, so the source is already available.
This is an open source project. Also, if privacy is important for you, you shouldn't look into subscription services, whatever software package they use.
By subscription I mean that I am happy to support an open source project with regular funding. Initial funds from Indiegogo are not sufficient to maintain a long-term service and we'd be hesitant to move our most important business infrastructure to something that may not be updated regularly as the security environment changes. If you were to look into making this a business with recurring revenue I believe you would find there is a lot of support.