Unfortunately it is not solved, at least I and some more users could not figure out how it works as well.
There is another thread discussion here with the same issue:
Hi there. Is this still not fixed, @Mac-Rae ? What a pity for all this great work if the email functionality isn’t working. It spoils the show. Even the two hotfixes posted by @Marc-Alexandre and enbyted do not work in my case. The folder selection window appearing in user mail settings is completely indifferent as to whether I tick or untick the mailboxes (which do correctly get listed there on the mail accounts tab, but missing on the general tab). If I untick them and then save the user’s prof…