Adële on Nostr: Is there a platform (other than Google, Microsoft or other major companies) proposing ...

Is there a platform (other than Google, Microsoft or other major companies) proposing to host mail service for a personal domain ?
I propose to host web pages with your own domain name on https://pages.casa/register-on-pagescasa.html and I'm looking for a complementary service for email. I could suggest it to #indieweb beginners.
I hesitate to open one because I'm afraid of spammers. It's easy to burn the reputation of a mail server.