I just started using http://nntpclientlib.codeplex.com/ and just posted my first article. But I don't know how to get the message-Id to the article that I posted. I have set up the article with only a subject, newsgroup and from-headers. I got a 240 response from the server after posting the article - but I don't see any way to get the Message-Id.
I just found out myself: You just have to add a random message-Id to your article-headers. If it is not already used by another article, the POST will be successfull.