I got away from self-hosted mail a few years ago and haven't looked back. There are a few flexible privacy-forward options on the market now (FastMail, Proton) and I don't have to worry about configuring DMARC/DKIM/SPF, Postfix milters, Horde/Roundcube, Courier, secure connection negotiation, X.509 certificates, or any of the other headaches associated with a quasi-legacy technology like e-mail.