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