New customer here. We had some success with campaigns so we implemented automated workflows and every single address I've entered into a workflow for gmail has gone into spam. We have properly configured our DKIM/SPF records and subdomain correctly. Based on reading other forum posts it's starting to lead me to believe that Zoho's sender IPs concerning workflows (possibly campaigns too) are just flagged by various domains. It seems like this has potential to happen when multiple companies share a mail server.