From what I hear, you might be violating your internet provider's terms and conditions by hosting websites and email server on your personal connection. And other email providers might also reject emails sent from personal servers. Anyone here has more information on these issues.
That being said. It looks like an amazing product. As a long time Arch Linux user this is very pleasing.
My current project involves a RasPi, iRedMail, a handful of inexpensive VPS providers with APIs that allow automated provisioning (DigitalOcean, NineFold, and Hetzner – to spread out the jurisdictions) – with the RasPi opening a reverse SSH tunnel for ports 25 and 465. Add in a DNS provider with a useable API so the 'Pi can spin up and shut down VPSes itself and update MX records to suit, and VPS images configured to not log anything mail-related (I'm learning Chef and/or Ansible to automate this), and I think I've gone as far as I can to secure my end of all my email.
(Possible over-paranoid ideas include refusing port 25 smtp connections that wont negotiate a secured connection in response to a STARTLLS command, and possibly blacklisting mail originating from any of the 8 known PRISIM participants. I like the _idea_ of ensuring none of my mail arrives from known-intercepted sources, but reality dictates otherwise since way too many of the people I really do want to communicate with are exclusively using gmail/yahoo for email - or worse still, have migrated largely to Facebook messaging instead of email)
Of course neither I nor the project are able to endorse anyone contravening their ToS with arkOS. So that is something that everyone will have to keep in mind. Once the dynamic DNS/proxy service is online for arkOS servers, this will be made clear.
Also emails from personal servers don't have issues in my experience -- the only thing is that you need to do it right. The major webmail providers each have their own specific rules before they accept mail from unknown servers. Provided that you do those right, there isn't much of an issue. arkOS intends to implement these as default.
That being said. It looks like an amazing product. As a long time Arch Linux user this is very pleasing.