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