if I have communications with someone through the internet with a homeserver. I would inevitably give out my IP address. Is that a bad thing? In my country they don’t have services like that, RTCing would be a bit sluggish using available euro servers.
It’s not impossible – if everyone starts doing it, then most public and common email servers cannot block them.
Self-hosting without applying these checks (which would involve signing a contract and exposing property data about the static IP address) is a thing used by spammers and they have the blocking automatized most times.