Email for self hosted services? (Not personal email)

Several of my self hosted services need to be able to send minor occasional emails for things like changing passwords or other notifications.

I’ve never been interested in the hassle of self-hosting my personal email, since I’ve heard about it being difficult. But for my little local services to have one admin@ or noreply@ to send from, with just a small handful of friends and family as users, maybe it’s simpler than a full personal email replacement would be? I’m not too concerned, for example, if they have to check their spam folders. As long as the email still lands. And probably wouldn’t need to worry about incoming emails.

What are you using for this type of thing? Hoping to have something not too complicated, and FOSS.

Edit: I also would like it to come from ____@mydomain.com