A New Internet-Draft is available from the on-line Internet-Drafts directories.
Abstract: «This memo defines Redirected email trace header which can be used to identify changes made to source and destination parameters of email message by SMTP forwarding and redirection systems and to identify what type of redirection took place. Original-* headers are also defined to show changes made to other headers by forwarding and redirection systems.»
http://www.ietf.org/internet-drafts/draft-leibzon-emailredirection-traceheaders-00.txt