After being subscribed to the list for two weeks and posting three mails on one subject I received spam on the address that I used to subscribe/post.
Either address harvesters are adapting to read the "name at domain" format that is used in the archive, or they auto-subscribe to mailinglists to get addresses from the traffic, or the news gateways leaks addresses, or whatever...
I'll unsubscribe and put this address on my blacklist of burnt addresses.
cheers -henrik