I've been a Snappymail user for a bit. UI is definitely needing some work, but performance is great, setup is easy, and it runs on docker flawlessly. Honestly,

I've been a Snappymail user for a bit. UI is definitely needing some work, but performance is great, setup is easy, and it runs on docker flawlessly. Honestly, for the quick webmail needs, it's perfect. If you want something with more features, there's always SoGO or horde.