"It potentially allows things like one machine setting up file transfer between two servers. Not sure if this was done, but could be done." Well I certainly re

"It potentially allows things like one machine setting up file transfer between two servers. Not sure if this was done, but could be done." Well I certainly recall doing it back in the 90s. I vaguely recall it was sending PASV to one server, taking its response values, and providing them in a PORT command to the other server. Then sending the RETR and STOR commands respectively to the two servers.