searching for {HEAD ~ the related e mail messages} by identifying {TAIL ~ each} of the related e mail messages having a same message originator identification inserted in the message originator field 
by identifying
searching for { HEAD ~ the related e mail messages } by identifying { TAIL ~ each } of the related e mail messages having a same message originator identification inserted in the message originator field
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH