When I send an email, I chose to store the emails on my IMAP account in the "Sent" folder, not on the "Local Folders". There the email appears as "New" and "Unread" ... which is neither true nor appropriate but simply annoying. This lowers the "professional" aspect of the product. Reproducible: Always Expected Results: EMails, sent by me, I declared in my identity settings to be stored elsewhere should not appear there as "New" and "Unread".
Seems solved in Kontact 4.14.7.