I tried again to upload a content but I do not received any mail notification, i waited for about 4 hours, still no notification. But when I restarted the alfresco service, i received the notification for the said activity. Just to justify it, I tried again to upload a content and waited for an hour, still no notification. When I restarted the service, that's the time I received it. Could it be probably the service has the problem? That needs to be restarted in order to received notification?