receiving spam to NANOG-harvested archive message-id's

I have received spam to a message-id@conti.nu address belonging
to a post to NANOG 2 years ago:

Thanks to a number of people, including List-Mom, that have pointed me to the
right location:
http://www.nanog.org/mailinglist.html and from there:
http://www.cctec.com/maillists/nanog/index.html
http://www.merit.edu/mail.archives/nanog/

It appears that http://www.nanog.org/isp.html is freshly redesigned and
is not (yet) linking to the above page.

And no, the archives have the headers stripped. Can't see the Message-ID's
there. Hmm.