I've got a BESX server with three users. One of them, using a BB8730, can send to outside e-mail addresses, but when she tries to send within her own domain, she gets the red X and it says it can't send because "user account is in invalid mode." This went away when I manually added all of the local users to her Contacts. But the problem has returned and that's not working anymore.
I have wiped, reactivated, to no avail.