[Sussex] Phantom Emails

[john]

Can anyone shed any light on the origin of about 10 emails that I have 
received in the last 14 days.  I am using SimplyMepis 6.0, Kmail, 
SpamAssassin & ClamAV ona standalone laptop. 

Each one shows as No subject: Sender unknown: Date Thu Jan 1 00:59 59 1970.  

Show all headers gives the following:
X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on mepis1.example.dom
 X-Spam-Level: ***
 X-Spam-Status: No, score=3.3 required=5.0 
tests=EMPTY_MESSAGE,MISSING_SUBJECT,
        NO_RECEIVED,NO_RELAYS,TO_CC_NONE autolearn=no version=3.1.3
 X-Virus-Flag: no
 X-UID: 
 Status: R
 X-Status: NC
 X-KMail-EncryptionState: 
 X-KMail-SignatureState: 
 X-KMail-MDN-Sent: 

The machine is multi-boot with XP home and Ubuntu as alternative os's.  XP 
would have gone last year but I cannot get the SatNav software program which 
installs the maps to run under Linux.  About 3 weeks ago I had to load some 
European maps and I did install the latest security updates for WinXP but the 
firewall  blocked the sending of updated system info to Microsoft.  Could 
these  emails be an attempt to probe my windows installation?

John Gregory
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