[KomoD]

Ask your users to mark it as not spam, also consider checking if your mail server ip is the issue.

[oscgam1]

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).

[intc]

Can you email me? Perhaps I can help. Contact information available here: https://c1.fi/about?lang=en (scroll down the page)