I'm not sure it would be a good idea to try to use mail as a surrogate for a file system, especially not a mailing list. You could use MIME Defang to strip the attachments, but it has other capabilities, too:
http://www.mimedefang.org/faq /Lars -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]

