generating a mail thread including {HEAD ~ at least two e mail messages} transmitted and received between a message originator and {TAIL ~ at least one recipient} 
transmitted between
generating a mail thread including { HEAD ~ at least two e mail messages } transmitted and received between a message originator and { TAIL ~ at least one recipient }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL