We’ve been seeing more notifications in Gmail that a “message was not sent to Spam based on your organization’s settings.”
This is likely due to either the overall Gmail spam filter or your personal spam filter becoming more aggressive based on what its learning.
We have configured Augsburg’s Gmail to not flag messages between Augsburg people as spam. So Gmail thinks the message may look like spam but we’ve told Gmail that email between Auggies is not spam.
The spam ecosystem is constantly changing and the Gmail spam filter is constantly learning as spam changes. These changes are normal and we always monitoring for ways we can make the email experience better.