It has no reputation. That's different from a 'clean' reputation, which takes history to establish.

You often have to build a domain reputation first. Certainly for Microsoft hosted email. I for instance show users with a Microsoft email a plain mailto:support@domain.tld link on my contact/support form. This way the first email is from them to me which helps building reputation and minimizes the chances of my response going straight into the spam box or worse, silently dropped. Regular users can fill in a proper form and submit it from the support page.

I get more spam from Microsoft and other tech giants than anyone else.

It's the companies whom you rely on for email that are the worst abuser e.g. airlines need to inform you about delays and abuse this trust with holiday adverts incessantly.

Any company that claims to require your email for two factor auth should be given automatically generated fines for every email they ever send that is not auth related.

That would shake up Oracle sales dept. :)

I like it. I've always wanted to promote mailto: links over silly contact us forms (and all the hoops you have to jump through to keep them functional and not abused) but never had a really good argument for non-techy folks and lots of pushback that mailto: is "not standard" and "does not work for some people" with very little evidence. This is a nice story for the 'pros' column.