That angers me so much. I had same IP address and domain for 15 years. Never a spam was sent from it, since the same address was used for NAT in home network I also blocked outgoing SMTP (forcing to use my SMTP instead) for cases that a PC got a virus and starts sending spam.

Things worked fine, but I think 2 years ago I realized that my e-mail started going to a spam folder. Fortunately adding SPF/DKIM appeared to fix it, but it feels like it is getting harder and harder now to have own mail server.

I would probably gave up, but it's infuriating to me that from courts rulings if your mail is handled by 3rd party, the 4th amendment no longer applies.