Gmail has become very aggressive with spam filtering and it's understandable with the amount of emails being sent. But this whole thing about spam filtering, dkim, spf, feel like band-aids over band-aids all the way down.
A customer recently filed a PP dispute that she never got the software she ordered. She didn't get my emails as all support and welcome emails were going to spam.
There has got to be better way to communicate without so many closed-source gatekeepers deciding your fate. It's been decades since the internet was invented yet we still use such a fragile non-deterministic approach for handing basic communication.