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 
received 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 OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH