As everyone has mentioned SPF/DKIM/DMARC is the absolute minimum. If you’re going to be sending your own mail then a PTR record is absolutely required. Also get registered dnswl.org and other whitelist sites. Be prepared to spend some time tracking down why the occasional email goes to spam. Then there’s the onslaught of bots and hackers constantly trying to break in.
I’ve used Mailu to host my own mail server, and at my work we have a standard Postfix/Dovecot setup.
My recommendation is to use Fastmail, Proton, or some other service to save you the headache.