I can second this. I used to selfhost mail and it was a lot of work to keep up. Nowadays I am also quite happy with protonmail but since I got cloudron installed for other services, I just enabled mail there and will see how that goes over the next few months, so far so good. Hopefully I can go back to email selfhosting through that in the long run.

Also I agree, the privacy implications when using a VPS is still something worth taken into account.