How to send an email in RTF format using EWS?

Question

I want to send one and mail in RTF(Rich Text Format) format using the EWS(Exchange Web Service API)

  ExtendedPropertyDefinition RtfCompressed = new ExtendedPropertyDefinition(0x1009, MapiPropertyType.Binary); 

                    PropertySet propSet = new PropertySet(BasePropertySet.IdOnly, EmailMessageSchema.Subject, RtfCompressed);

                    EmailMessage email = EmailMessage.Bind(wsExchange, emailID,propSet);

I wonder if it is these parameters that I pass to the objects of the Extendedpropertydefinition and Propertyset classes