WE are using exchange to schedule conference rooms to automatically book rooms and block the time for all attendees. Some attendees are off site as well as on site using the exchange server. Some or off site using a remote email server hosted by the web hosting company. When we send out a invitation to a meeting...we send it out using a .com email address. We do this even to the in-house attendees. They all try to accept, but it tries to send back on the .local address of the sender. Even if the sender is sending on a .com address. The emails then bounce because the remote mail server does not recognize email@example.com. Why does it not send back at the email sending the meeting request....firstname.lastname@example.org.