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I assume you are referring to the "Recent Activities" notification ? If so, then you can override the "activities.feed.notifier.repeatIntervalMins" property (ie. by adding/editing in "alfresco-global.properties"). The default is 1440 (mins) => every 24 hours. If you want emails to be sent every 12 hours then you can change this to 720 (mins).Regards,Jan