

I host my mail with mailcow and it is almost set and forget. I only had a couple issues with some mail providers, but a small email exchange with the admins cleared that up.
Have a handful of users, that have not complained about anything not working or spam or whatever 🤷♂️
Yep, there even was a standard that would have been sufficient, Do Not Track. https://en.m.wikipedia.org/wiki/Do_Not_Track