I've had a few issues trying to change the default mail client on El Cap. In nearly every case, after changing it in Mail (seemingly the only place you can actually change it), the change doesn't stick. After quitting and...
Read More

Edit: November 2021 People seem to still be hitting this story, and by and large these steps usually work. If you are still relying on macOS Server however, you need to migrate to another platform with some degree of urgency....
Read More