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I am suffering from the winmail.dat problem. I tried to fix the problem through making email senders. But no success.
In this "How to Prevent the Winmail.dat File from Being Sent to Internet Users" document, Microsoft says:
... Winmail.dat may be automatically added to the end of the message if the recipient's client cannot receive messages in Rich Text Format (RTF).
How does Outlook know if a recipient cannot receive RTF messages?