I may need to take a break from using Emacs/Mu4e for email. Too many times during the day I run into some little snag. Email should be frictionless and my Mu4e setup is not. Back to Mailmate for now, then.
All I had to do to make it work is edit the hardcoded path in
/Support/bin/add to point to my inbox.org file.
Another catch was that links to email messages in Org didn’t open Mailmate. The links weren’t linked. I added the following to my .spacemacs file and now everything works swimmingly.
(org-add-link-type "message" 'org-email-open) (defun org-email-open (record-location) (shell-command (concat "open \"message:" record-location "\"")))