I host my own mailserver, and to be honest it’s pretty painless. Usually I just let it run without giving it any thought. It’s on rare occasions that I need to put a bit of work into improving the inbound spam scanning.

Selfhosting does need quite some knowledge of the software stack and several additional protocols to set them up correctly to get your outgoing email delivered. Also, like already mentioned in another comment, you absolutely need an IP address from a non-blacklisted subnet (I think most VPS providers will be okay, residential definitely not).

My software stack: Arch Linux (soon NixOS), Postfix, Dovecot, rspamd, opendkim, opendmarc.

Additional techniques configured: SPF, DKIM, DMARC, DNSSEC.

As you can see it’s quite a lot, and I’ve been doing for more than 20 years now, so my opinion can be a bit skewed. I’d say go for it if selfhosting is a hobby.

Agreed, Nextcloud News is awesome! The app too. And it’s a given that Nextcloud itself is already awesome.

Yes, all Teslas in Europe have CCS