bounce.pl is used to bounce mailing list messages to a new address with all of the original headers intact. The header lines
X-mailing-list: list_address X-archive-with-date: original_datewill be added to the message. The original date is identical to the Date header. The messages are taken from mail files listed on the command line.
This is a mirror of some of the files previously found at http://www.mail-archive.com/contrib/bounce/, which is currently 404.
I am not the author of bounce, but for the time being you can send questions / bug reports to me and I'll try to get hold of the right person.