The timestamp may represent, for example, the actual creation time, the time {HEAD ~ a message} is received by {TAIL ~ an electronic message service} for delivery, or any combination thereof 
is received by
The timestamp may represent , for example , the actual creation time , the time { HEAD ~ a message } is received by { TAIL ~ an electronic message service } for delivery , or any combination thereof
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH