Mac Server on Sierra won't sign email with DKIM
I'm running Mac Server 5.2 on a new, clean install of macOS Sierra. Since upgrading to Sierra, my outgoing email is no longer being signed with DKIM. I followed the same steps I did previously (summarized here: https://classicyuppie.com/protecting-your-domain-with-spf-and-dkim/). Has anyone figured out how to get DKIM working with Server 5.2 on macOS 10.12?
MacBook Pro, OS X Server, Running on macOS Sierra