As I consider the resending of a mail (mutt and elm users know it as "bounce" an email) so extremly useful in some cases, I wrote a zimlet that can resend a single mail to an arbitrary email address without modifying the
FROM:, TO:, DATE: and all other header lines.
I named it com_zimbra_resend.zip and you can download the package here:
Index of /zimlets
(Zimbra-Resend-Zimlet-0.80.zip contains the com_zimbra_resend.zip and an
README).
Regards
Thomas