dividing {HEAD ~ the mail thread} into {TAIL ~ respective segments} by analyzing the at least two thread body intervals of the thread body field in the each of the related e mail messages 
dividing { HEAD ~ the mail thread } into { TAIL ~ respective segments } by analyzing the at least two thread body intervals of the thread body field in the each of the related e mail messages
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH