Hi Peter,
When I add a emailMessage with ITH directly in an Inbox folder, its content is the same as a real one(received via outlook), but in the unread messages list, they are different.
(see picture)

- Icons are different. The icon with the pen (email create via ITH) seems to be a drafts email icon not an unread email.
- The first email (received via outlook) shows us the sender name and the second email (create via ITH) shows us the "To adresse".
My question is : Can I change the type of a message ? (a drafts message convert to a received message for example)
I see "MessageClass" and "MessageFlags" properties but I don't know how to use it.
Best regards,
Inophage