We want to allow parents / students / others to choose their directory privacy settings such as not displaying email address to specific constituents, which is possible through privacy settings. However, students have the ability to hide fields like email address from teachers and advisors. This affects the Send Communication function in class / activity groups, so a teacher that wants to email all students may miss one because the student has hidden their email. There should be options to prevent this or Send Communication should always include parent / student emails for the group.