Though I doubt it's the case in this circumstance, it is important to keep in 
mind that an attacker can append additional headers to the initial message. 
This can create the appearance that the email has moved through more servers 
than it really did. Don't put too much faith in the headers which you can't 
corroborate with log  file entries.

Richard Esplin

On Tuesday 27 December 2005 23:23, Brian Phillips wrote:
<snip>
> Headers are very hard (if not impossible) to
> forge because instead of the computer sending the mail, it's actually
> created by the server receiving the mail.  The extent of headers being
> forged is an open relay being used to initiate the connection.
<snip> 

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