AdamTT

> > > I'm not quite sure how to determine whether message is inbound or outbound from TB API, as original Correspondents column does - especially for folders containing both...

Well, I understand. I guess U read addresses direct from particular message headers, right?

I see nsIMsgDBHdr reads only few headers. It is not able to check (for example) presence of header 'Delivered-To:' or 'Received:'?

OK, I give up. Just promise me you will leave the note here if u discover a solution in the future. PS. Mówisz po polsku, nie? :)