Business Rules

For Students

1. Always have the lowest priority in message delivery.
2. Can send to any particular group of other students/teachers/staff.
3. Can delete their own messages on their own inbox.

For Teachers/Staff

1. Can have an option for highest priority in message delivery (always on top on the inbox by default).
2. Can send to either a particular group of students/teachers/staff.
3. In order to send to all, the teacher/staff must notify the System Administrator through mailing.
4. Can delete their own messages on their own inbox.

For System Administrator.

1. Can have an option for highest priority in message delivery (always on top on the inbox by default).
2. Can send to either a particular group of students/teachers/staff.
3. Can send to all (message will be posted at home page).
4. Can delete their own messages on their own inbox.