Yeah, checked mail server IP and it isn't the issue. Our users are marking the email as not spam, but they have to do it for every single email. 10 days after

Yeah, checked mail server IP and it isn't the issue. Our users are marking the email as not spam, but they have to do it for every single email. 10 days after our mail started ending in Spam, our domain Authority decreased. It should have been the other way around (First Domain Authority should decrease and then mails should go to spam).