I've been using Migadu for a while, and haven't experienced any headaches. Which features/services do you offer that Migadu doesn't which makes things easier?
2. Extremely easy-to-use dashboard and overview page with insights on which domains/users are eating up your data
3. Docs. We've gotten a lot of love for our docs. It'd be easier just to show you: https://mymangomail.com/docs/