On the settings/automatic_responses page Yes/No attributes can be set to Yes but not to No (Django < 1.10)

The settings are Send welcome message (send_welcome_message), Admin immed notify (admin_immed_notify) and Notify admin of membership changes (admin_notify_mchanges). These can be set to Yes when No, but when Yes cannot be set to No. This may be related to the fact that the string 'False' evaluates to True