Hi, I am using Exchange 2003 and Microsoft outlook 2003. I have an SMTP sink that catches the incoming emails. I noticed that all emails coming through MS Outlook have a content type application/ms-tnef ; name="winmail.dat" (by checking the CDO message within the sink) when it should be text/plain;...... my outlook settings are as follows: Mail format : Plain text Internet format : Convert to plain text and using unicode (UTF-7) I am sending plain text without attachment. Any help would be very much appreciated, Thanks