I use it with Fastmail for my main email + calendar + todos, and I use it with Purelymail[1] for simply emails with no nonsense.
Both accounts, once setup, just behave.
On the groupware front, I use DavX5 and ICSx5 to do to calendar and todo sync to fastmail, and Tasks.org [2] to do the front end for the todos.
For my work accounts, I use the nine email app which lets me authenticate to exchange active sync without needing a work profile on my phone so I can see emails, calendar, todos etc.
Both accounts, once setup, just behave.
On the groupware front, I use DavX5 and ICSx5 to do to calendar and todo sync to fastmail, and Tasks.org [2] to do the front end for the todos.
For my work accounts, I use the nine email app which lets me authenticate to exchange active sync without needing a work profile on my phone so I can see emails, calendar, todos etc.
[1] purelymail.com
[2] https://tasks.org/