Right now, when someone sends a message to many recipients (140+), the
Exchange server injects the X-SMTP headers in the middle of the 'To:'
headers when it is delivered to our sendmail unix systems. Using a
network sniffer, I've verified the headers are inserted by the
Exchange server. This causes problems when the message is forwarded
any further. Anyone know if this is a documented error? Also, isn't
inserting a header within a header an RFC violation?