email headers

Can anyone tell me what it means in the email headers when it gives the
domain and IP address of where the message is from and followed by *may be
forged*?

Thanks,
- - -
Kevin

"The Web brings people together 
because no matter what kind of a 
twisted sexual mutant you happen 
to be, you've got millions of pals out 
there. Type in 'Find people that have 
sex with goats that are on fire' and the 
computer will ask, 'Specify type of goat.'" 
- Jason Alexander (from Seinfeld)

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