ZOHO Compain emails going to spam after authentication is successful

ZOHO Compain emails going to spam after authentication is successful

Hello, 

I am frustrated right now. I have recently setup the zoho email compaign, The auto responder email went to receipient spam folder. then, I researched a lot and completed authentication (SPF, DKIM) in email deliverability, email relay in zoho crm. The first attempt of the test was successfull ( may because the receipeint domain is hosted on the same domain provider) to the receipient inbox. then, I published my compaing in Linkedin. Then, tested again using another email as recepient and the email went to spam. 
Not sure how to fix it. Please please help me.