I'm able to send & receive mail to/from almost anywhere. My problem is that my users can't send mail to Microsoft domain email address. I've found other problems that admins are having that are similar, but not quite the same. The messages don't go into the Junk folder, they don't show up at all. I've checked my logs, and even setup a debug_peer_list with hotmail.com in it. Everything looks good - I see the normal 250 messages, "Sender OK", and finally "status=sent".
Please solve this problem.