Where are these postings stored?

See http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-campaign-sn "List of messages" would be adequate for you. http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-recent-sn You can obtain messages if you subscribe to this list. (Postings are not currently archived for some reason)