Actually, since if any router,server, etc on the way to where the packets are going wants only max packet size of 1492, then your goal is to have the copier's 1500 converted down to 1492. There are some reasons why it is still possible for packets that have been broken into smaller sizes not to be accepted, but that probably won't occur in this case. Depending on what happens, you may want to try the free version of argosoft email server software as a relay, and/or use wireshark, etc to capture packets and upload the capture file for us to look at.