Can forwarded emails be razor-reported ?

Spam that I receive, i use the BOUNCE command to preserve it
in its entirety to the SPAM mailbox which I then periodically
pipe to razor-report


However, users from other sites  FORWARD THE EMAIL to SPAM mailbox
(Most are PC users, they do NOT have a 'bounce' command)

Therefore, the User appears as the SENDER.  Is this going to cause
problems if I razor-report such emails????  or the signatures is
based on the content and not the sender?  (Sender ip address and
domain name matters more to the Blacklists instead?)

Have been using razor in production for a week now and its
great !!!!!!  catch 20% more spam than procmail filters alone and
virtually zero administration 

THANKS


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