Yes, for about 27 years now. I spend a few hours per year in maintenance and configuration, hardly ever see spam and manage to get most of my messages delivered

Yes, for about 27 years now. I spend a few hours per year in maintenance and configuration, hardly ever see spam and manage to get most of my messages delivered - even to Google- and Microsoft-hosted addresses. The server-under-the-stairs (dl380g7, Proxmox running containers with services, one of those being the mail container on which Debian/Exim/dovecot/greylistd/spam assassin/dovecot-sieve). Backup to several external locations, mail archived for about 25 years.