Would agree.

Even when done 100% by the book and correct. Companies like Google and Microsoft, in particular, will just randomly send the email to spam.

I gave up after years of fighting the good fight and went to googles free tier. That is now over and I probably just need to move to some other service.

Also dont use a gTLD or if you do, have a backup .com or .us as well. Many forms dont recognize things like .email as legit.