There’s been multiple reports over the last few weeks of emails from Gsuite being rejected due to the below details, I’ve been unable to verify it from a gsuite account.
The response from the remote server was: 554 5.7.1 High probability of spam
Here’s one example of it, including the full email headers of the rejection:
https://wordpress.slack.com/archives/C02QB8GMM/p1704295191477689