Contact groups not loading in mail address line
I have been able to send emails to a bulk contact group which I use regularly. Recently though, I have been unable to get the group to load into the "BCC" line by typing the name of the group as I used to. It does not connect with the contacts and has no cards attached. How do I reset this so that my groups are working again correctly?
iMac 27″, macOS 10.15