We have always had great deliverability with the nurture email shown below. Comes the new year, we are now getting marked as spam from several ISPs. I drilled this down to Cloudmark flagging us as spam and it seems to only be with emails that have a low text to image ratio. Even this email below, that showed 96% inbox in deliverability and a pass from Cloudmark before the new year - now all other spam companies give us a pass, except Cloudmark (who works with several ISPs) - where deliverability dropped to about 60%.
Any ideas on how to rework this email to help with getting past Cloudmark - besides adding more copy? (not need in footer - social buttons and our logo again). I tried slicing images in half but this did not do anything. Does text to image go by number of images or size of imagery compared to text?
Right now - banner, footer, body image, logo, and social buttons are images - which will pass all spam filter companies except Cloudmark.