I've written a similar article to this a few years back, so this isn't a new problem and obviously little has been done to fix it:

https://penguindreams.org/blog/how-google-and-microsoft-made...

I have SPF, DKIM, reverse DNS, DMARC .. all the things, and yet I still get e-mail dropped.

Will you guys fix Postmaster tools for small servers? What can I do to send e-mail to my friends?