You can view it with a web-browser using the gmane interface at: http://news.gmane.org/gmane.org.wikimedia.mediawiki it's a little slow at times, but ok
Mediawiki's communication page (http://www.mediawiki.org/wiki/Communication) also has a link for a newsreader, if you prefer that.
Lionel
or you can use Gmail in web-browser :)
mediawiki-l@lists.wikimedia.org