From: Mike Scott on
John Thompson wrote:
> N.B. "From:" headers can easily be forged, but "Received:" headers
> typically cannot be forged.

More precisely, you can trust 'received' headers added by machines you
trust (probably your own server). Any added before the mail hits your
trusted machine(s) are suspect - I've certainly had spam with obviously
forged 'received' lines.

Mike Scott (unet2 <at> [deletethis]
Harlow Essex England