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