I'm likewise curious - a family member runs a mail service on a box in his basement for everyone with a @lastname.com with about 40 or 50 inboxes. He's indicated he'd like to pass that responsibility on as he's nearing 75 years old and the everchanging spam and delivery rules make it tedious to keep up, but I have very little interest in running a mail server myself. Would love to find somewhere for super low volume mail under $100 or $150/month that could keep that domain intact..
I've been pretty happy with purelymail.com. It's really cheap (~$10 a year) and has unlimited mailboxes and domains, perfect for low volume. The downside is that it's a one man operation, so if you need more reliability for the technically illiterate, migadu.com or fastmail.com might fit the bill. I don't have personal experience with either, but my friend swears by migadu (which also supports unlimited domains and mailboxes).
Search on HN for either, there's lots of discussion and reviews from accounts way older than mine.
Look into Migadu.com, a service out of Switzerland with very reasonable pricing. You get a set amount of storage space and inbound/outbound limits and everything else like how many inboxes you create is up to you.
1. Improve the models from an architecture and security standpoint
2. Set industry standards for AI models
3. Recruitment