The IMAPISession::MessageOptions method displays a dialog box showing option properties for a particular address type and message.
HRESULT MessageOptions(
ULONG ulUIParam,
ULONG ulFlags,
LPTSTR lpszAdrType,
LPMESSAGE lpMessage
);
The IMAPISession::MessageOptions method presents a dialog box displaying properties that relate to a particular message and addess type. These properties are under the control of the transport provider handling the address type. Users can make changes to the properties, but these changes do not take affect until the client calls the message's IMAPIProp::SaveChanges method.
Users can make changes to option properties that apply to:
Changes made to the option properties for a particular message and address type do not affect the option properties that apply to all messages.
For more information about working with message option properties, see Message and Recipient Options.