[ill0gicity]

I've been using Mailu (https://mailu.io/) for years and have had no problems. I love that it has the concept of domain admins so that people can manage mailboxes for their own domains. DNS isn't automatic, but meh. Upgrading is easy (Docker + automatic migrations).

[BLKNSLVR]

Another happy mailu admin here. Although the domains aren't well used or critically important to day to day things.