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