You can log in to google groups and change your preferences so that you get a daily digest, or so that you don't get any emails and can go on to the group to read the posts. If you're unable to login, you can email the administrator of the group to request your subscription be changed as such. That way you can just read the newsletter and avoid all those pesky "private" discussions, like which readings people would like for an upcoming church service.
I apologize to anyone who finds this topic cluttering their inbox, who would prefer not to know how to change their preferences.