We are using Zoho mail at our organization. And most of our outgoing email have started landing in spam folders. Specially for google and outlook receivers.

I did a deliver-ability test and turns out the IP used to send out our emails is in a blacklist.

Here is the link to the test: https://app.mailgenius.com/spam-test/214d5e

I've also attached the screenshot in case the link stops working.