sendmail question...

Anyone know how to get a Delivered-To header (or similar) in sendmail?
When a message comes in at foo@bar.com, it might go through several
translations in the virtusertable before popping out in my mailbox, but
there seems to be no indication that it was originally for foo@bar.com in
the message headers (that is unless the sender was kind enough to place it
in the To: field, but that generally doesn't work with spam).

    --Nick