Of course Google and Microsoft both punish me by sending my mail to spam (even years later) for using my own domain but that's what I'd expect from the big players.
From what I can tell it's just that small domains are guilty until proven innocent. However it seems at lower volumes you can never send enough email to get past the thresholds they've set so you're forever guilty in their eyes. Very convenient.
I've also signed up to both Microsoft and Google's email tools and neither shows any information because I don't send enough mail while they still keep making my mail as spam. It's getting to the point where I'll probably have to use a 3rd party SMTP rely as the family don't appreciate their mail going to spam while all their friends on GMail go straight to the Inbox.
A nice new addition is Microsoft is flagging any links I include in my message as "suspicious" and giving the users scary warnings. Meanwhile I can see they still take the opportunity to scan and fetch the URL and yet still can't determine it's safe.
Interestingly when I logged into Microsoft's Smart Network Data Services I could also see my VPS provider had claimed the IP block as well so they were clearly invested in making sure spam was under control. But nope, still not enough for Microsoft. At one point the mail was even getting hard 550 refused. I contacted their support who to their credit replied, but to less of their credit gaslit me and claimed there was no blocking occurring despite me pasting them full error message with all their tracking IDs in it. The next day mail was allowed in again but still ends up in spam.
I think to switch to my own domain mail adress but I think to use Migadu [1] instead or even try to host anything.
If only they would send everything to spam. Microsoft outright blocks all mail from my VPS because some other IP on the block allegedly sent spam. Of course since I'm not running a commercial business I can just tell people to use a better mail provider if they want to create an account - not worth my time to deal with shitty megacorps.