This started happening about a month ago and have been reading forum posts to try to figure out the problem. As near as I can tell it's related to the DKIM and DMARC settings. I have carefully made sure the DKIM records are correct, but http://www.isnotspam.com/ continues to show that the DKIM can't be trusted. 

I use GoDaddy for a domain host which is perhaps relevant as my e-mail shows the domain not the zoho address. Kind of at a loss at this point and would appreciate help.