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