Run it your way.

Same apps, same shared pool — four ways to run it. Stay free and local on your own devices, let us host your domain's mail, lift the whole stack into your own cloud, or keep it entirely on-prem. Pick a mode below and trace how mail moves; hover any block for what it does.

The point is freedom: your email infrastructure should answer to you, not to an expensive, complicated cloud vendor you can't walk away from. Start in one mode, move to another whenever you like — without switching apps or leaving your data behind.