Notification service
From OpenKM Documentation
The application permits notification by email of the creation or update of a new document.
The user to whom the application has sent a notification by email will see a message with a direct link (URL) to the document, the user who has caused the notification, and a message (description) if the user has supplied one. The "subject" of the email received by the user will be something similar to the following:
OpenKM - NOTIFICATION - "Document Name"
The user can create a filter in their mail client with the name "OpenKM" or "OpenKM - NOTIFICATION" to centralise in one single folder all notifications generated by the OpenKM.