You could try using sendmail's '-f' switch, but here read this quote from the sendmail manpage.

<quote> -f name
Sets the name of the ``from'' person (i.e., the sender of the ail). -f can only be used by ``trusted'' users (normally root, daemon, and network) or if the person you are trying to become is the same as the person you are. </quote>

mitd-Made in the Dark
'My favourite colour appears to be grey.'