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