In my area it’s seen as disrespectful, I think the Gen Xers are hung up on high school athletics where their coach would shout their last name

“No not like that!”

Your time is their money. Capitalism is powerful because you live on the scraps of what you make while giving most everything to the person that tells you to make it. Not sure how anyone who collects payments from customers for repairs or installations, can remain sane after seeing that they’re billed out for at least 10x what they get compensated.

I would caution against self hosting email long term. It’s fine for the educational value but there’s a lot of annoying obstacles you can encounter repeatedly even after everything is established.