I use a Google Group to manage a large course, with many students and teachers. Last year it worked fine. But this year, I noticed that most messages sent by students to the group address, are marked as "Spam" by the Gmail account of me and the other staff members.
I can solve the problem for myself by creating a filter for this specific group, with action "Never send it to spam". But then, I also have to explain to all the other group members (more than 200) to do the same, which is quite time-consuming.
Is there a way to "white-list" a google group, so that Gmail's spam filter does not classify it automatically as spam?