I would like to propose that the components making up the subject line of the announcement emails to be reversed, so that the course code that the announcement is relevant to shows up first before the actual subject.
e.g. instead of the current "Group membership clarification: MBCHB 221A/B: MBChB Part II", to change to "MBCHB 221A/B: MBChB Part II: Group membership clarification"
The key reasons why I believe this would be an enhancement are (there may be others):
This would more clearly establish the correct context for the subject, particularly for students taking multiple courses, or staff who teach on multiple courses.
This would enable students (and staff!) to more easily sort email announcements by the course codes of courses that issued the announcement, rather than having to remember the exact wording of the subject.
This would make filing and retrieving announcement email messages much easier.
Edited 2016/03/05: I agree with Nathan Phillips' suggestion below. It would be even better if the course identifier can be put in brackets - i.e. [MBCHB 221A/B: MBChB Part II] Group membership clarification
Thank you very much for your consideration!
Professional Teaching Fellow, University of Auckland (New Zealand)