I just updated to 18.2.4 (1517) and now suddenly my Mac Mail fonts are all boxes with question marks again after almost 2 weeks of the problem being solved.
Don’t tell me to read the literature because Extensis literature is NOT up to date. It doesn’t address anything in Sierra.
I did everything it says. I don’t run ANY type 1 fonts and I still have the problem.
I’m very seriously considering switching to another software because it’s clear there’s very little support for Macs from Extensis.