Here's a Tweet by the author of the blog post that kicks off the Twitter thread where this blog post article was announced:
After self-hosting my email for twenty-three years I have thrown in the towel 😩
Email is now an oligopoly, a service gatekept by a few big companies which does not follow the principles of net neutrality.

Many people are asking me to name and shame, so I will do it:
Microsoft. I have been unable to deliver a single email to a Microsoft server in the past five years.
live-dot-com, outlook-dot-com, and any organization using Office 365 as their email server. It goes to /dev/null
I was an engineer at an email service provider for a decade.
I knew something was very wrong when we started hiring deliverability specialists who didn't work in engineering.
Why? Their job was relationship building & professional networking with ISPs & spam blocker providers.
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