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Profile > Preferences > Emails and Notifications > New group streams > yes (all group member have the same setting)
Group > Options > Edit > Notification Settings > Enable Wall Post Notification > no
Result = Group Members still receive a email Notification
Profile > Preferences > Emails and Notifications > New group streams > no (all group member have the same setting)
Group > Options > Edit > Notification Settings > Enable Wall Post Notification > no
Result = Group Members received not a email Notification tested on testpage with latest 3.2.1.6