Tracking the source of emails

[T Nguyen]

To all the email experts,
	I have a puzzle to figure out and track the individuals who sent the
	emails to the soc.culture groups. The individual caused a lot of
	tensions for the readers so we'd like to find out how we can track
	him down.
	I extracted the headers of email from my system.
The question is:
	Is there anyway to track down to the machine/site who posted the news ?
	If the answer is yes then I have 4 following questions?
		Where EMAIL1 message is generated ?
		Who would be the responsible site ? i.e., the postmaster ?
		The same question would be repeated for EMAIL2.
		Where EMAIL2 message is generated ?
		Who would be the responsible site ? i.e., the postmaster ?
	The soc.culture.[hongkong,vietnames] would appreciate your expert help.
						Thanks
P.S.: I have tried to look at the email paths, and message ID, but
I'm still not sure how to do it precisely. Accuracy is very important
here.
The person who posted EMAIL1 promised he will launch his message 
again on soc.culture.hongkong on 02/23/1991 at 3:00AM

EMAIL1>From grapevine!newstop!sun-barr!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!tut.cis.ohio-state.edu!ucbvax!MTUS5!SFWPIWR Tue Feb 12 11:48:59 PST 1991
EMAIL1>Article 2239 of soc.culture.hongkong:
EMAIL1>Path: grapevine!newstop!sun-barr!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!tut.cis.ohio-state.edu!ucbvax!MTUS5!SFWPIWR
EMAIL1>>From: SFWPIWR at MTUS5
EMAIL1>Newsgroups: soc.culture.hongkong
EMAIL1>Subject: Kong's faked products.
EMAIL1>Message-ID: <9102101551.AA28384 at ucbvax.Berkeley.EDU>
EMAIL1>Date: 10 Feb 91 15:51:27 GMT
EMAIL1>Sender: daemon at ucbvax.BERKELEY.EDU
EMAIL1>Lines: 54

EMAIL2>From grapevine!newstop!sun-barr!apple!agate!pasteur!SFWPIWR at MTUS5.CTS.MTU.EDU Thu Feb  7 21:35:24 PST 1991
EMAIL2>Article 2181 of soc.culture.hongkong:
EMAIL2>Path: grapevine!newstop!sun-barr!apple!agate!pasteur!SFWPIWR at MTUS5.CTS.MTU.EDU
EMAIL2>>From: SFWPIWR at MTUS5.CTS.MTU.EDU
EMAIL2>Newsgroups: soc.culture.hongkong
EMAIL2>Subject: My Apology
EMAIL2>Message-ID: <10914 at pasteur.Berkeley.EDU>
EMAIL2>Date: 8 Feb 91 03:53:23 GMT
EMAIL2>Sender: news at pasteur.Berkeley.EDU
EMAIL2>Lines: 33