I think this is primarily a problem of the domain owners/sysadmins, all my domains have SPF, DKIM, and DMARC and I also keep them monitored for any blacklist/al

I think this is primarily a problem of the domain owners/sysadmins, all my domains have SPF, DKIM, and DMARC and I also keep them monitored for any blacklist/alerts, if you are not aware of these, you should hire someone to audit it, email protocol is broken by design and all of these are duct tape solutions to prevent OP attempts. This whole document gives me nostalgia back in the late 90s early 2000s how there were tools you install to spoof emails!