For email I think the best choice is still M365. It’s not free and not self hosted but IMHO it’s by far the best e-mail/collaboration suit that exists

Don’t have any idea on how to implement it IMHO you need to add some kind of support for e-readers like Kindle and etc. Some people read on theirs PCs but the reading experience it’s much better on readers devices.

No problem so far. Working perfectly here.