My first email usage was at University, pre-WWW. After that I briefly used some ISP email service, but that was on a time of very limited storage and POP only accounts, so I started hosting my own email even before having an always-on internet connection, using a relay and dynamic DNS to receive email when online. Now a days, I use a small VPS to route and receive email, but final destination and storage is on my home server. Over the years, I had, like others here, to ask Outlook and other providers to unblock my IP or domain, but it has been rare.
I really don’t want to live in a world where only two or three companies run email for the entire world, and this is my little act of resistance.
outlook.com keeps sending me dmarc reports with failed dkim... while every single other provider gives pass to all domains. at this point I don't even care anymore.
They have a crappy internal DNS caching server in the email infra that times out early and returns NXDOMAIN for timeouted requests, causing permfail for DKIM instead of tempfail as RFC suggests in case of DNS timeouts. This crap has been going on for years.
I really don’t want to live in a world where only two or three companies run email for the entire world, and this is my little act of resistance.