Hi Zoho Campaigns Support, 

Please help investigate why my open rates are lower than when I send similar emails via MailChimp. Previously, using MailChimp, my email open rates were approx. 20-30%, and now after switching over to Zoho Campaigns my open rate has dropped to 15-18%. This ultimately affects click rates as well. 

I've authenticated my SPF and DKIM. I send emails to contacts, and the sender addresses are the contact's Zoho CRM owners (my sales reps). 

I've checked my domain on various domain/ IP address verification site and it all looks fine. 

Please help check my email deliverability and explain possible reasons for this drop. 

Thank you.

Nic