Patience. After some time with no response, bump your thread up again. Threads can get lost rather quickly with the amount of traffic on a site/forum like this.
But you have to remember, this is a free site where others answer your questions in their spare time, for free. Some might know your answer, some might not. Your question might get answered within a minute, it might take a week or so. But there is no gaurantee you might get a response.
Good luck.. if I knew something about Postfix, well, I might be of help but since I've never used it, well, I'm worthless on that one.