@charlesnw yes, the OP is a recommendation to add this as a health check notification. I don't think it would be practical to try and automate the setup, when a simple notification to advise it is missing and needs the user to setup with their hosting would save from a lot of bounced mail head-scratching.
I solved this for myself through accidental discovery.
There's no greater crime than wasting someone's time, and any user not knowing this is needed could lose unlimited amounts of time not knowing this is the problem.
Basic need.
Basic solution.
No reason to debate if this is a good idea.
Just persuade that it would be a respectful thing to implement.
As I say, I'm alright.
I'm giving time to this thread to help save others from lost time from not knowing this is their issue.