Let's imagine that you resend mail that someone else sent you. I'm not
speaking about moderated list, just the regular stuff. You have two
choices: either mark the file as coming from the resender, or from the
original sender. The person who'll get the various messages about mail
being succesfully distributed is the one in the from field. I find it
more normal to have the resender get this and be marked as sender of this
peculiar piece of mail, and have the original sender an "Comments:
Resent-From:".
Eric