That's so frustrating. The biggest AI company in the world and their anti-spam system is so stupid? Really lowers your expectations on state of the art tech.
Relevant providers usually just require a few days of sending legit mail and occasionally asking to be unblocked, but there seems to be no chance getting into the inbox on GMail and Outlook with a "too low" sending volume.
If it wasn't for regulations, I would have already given up and switched to GMail.