New to Zoho and testing it out. I brought over one of my domains, set it up for email and successfully added and authenticated both SPF and DKIM in Zoho Campaigns. 

With other email hosts that I've worked with, my outgoing email will show Mailed-by: domain.com, and signed-by: domain.com.

Even though my TXT records are verified with Zoho, and have verified on 3rd party sites (dkimcore and kitterman), only the mailed-by: domain.com appears in my sent email. If I check the headers, or source in the email, DKIM is nowhere to be found. Only the SPF: pass is mentioned.

This is unlike any other email I have ever set up, so I don't know if the DKIM is really working even though it was verified. Any ideas before we consider using Zoho for our business needs?