This option removes metadata from Microsoft Office attachments en-route to reduce potential exposure to hidden information saved in the properties of the file.

1. Compose an email and attach the documents.
2. Click on the Send Registered button to open the features panel.
3. On the Attachments section check the Clean hidden meta-data from Office Files option box

4. Click on the Send button

Note: The attachments in the “Sent Items” folder retain the documents' metadata.