This is exactly the kind of project we need these times. I hope this works out OK for these guys (I am backer #7). I hope it works out for us backers. Also I hope someone will later make a RaspberryPi image with almost the same functionality, ready to download and use (but, alas, you have to provide your own mail domain). Still, this is the right thinking. Email is the one protocol we easily can have at home, reasonably secure, with all the benefits and almost no negatives. My peers do not even need to know where the mails go!