siriussidus

You can still submit mail to virtually any mail server using telnet. I just tried it on Gmail for curiosity, and it did work!

I disagree vehemently on the difficulty of running your own email server. I have been running a pretty standard postfix + dovecot email setup for myself and close family for almost a decade now.

It definitely is necessary to once set up proper DKIM, SPF, DMARC and TLS by default (thanks to Let's Encrypt), but after that the setup is pretty much hands-off.

Spamassassin filters my spam down to at most one mail a day, and that's usually because they have some new type of topic not caught by the previous bayesian filter.