How to extract attachments from messages that contain Winmail.dat files
MDaemon 18.0.0 and above includes the ability to extract attachments from Rich Text format (RTF) messages used by Outlook and place them in the message. Attachments appear as winmail.dat in messages viewed outside of Microsoft's Outlook client.
To enable this feature:
Open the MDaemon configuration session.
Select Content Filter
Check the Extract file attachments from winmail.dat (Outlook RTF) messages checkbox.