Hosting an email server in these days with DMARC, SPF, DKIM and all those mail filtering blacklist is is world of pain but that's the price to pay for reduced s

Hosting an email server in these days with DMARC, SPF, DKIM and all those mail filtering blacklist is is world of pain but that's the price to pay for reduced spam I guess. I wish there was a modern protocol equivalent with authentication builtin.