It seems the gateway is passing a lot more spam these days.

Looking at my mail headers I see:

> Received: from Usenet via a Usenet to mail gateway located at
>     comp.lang.ruby.  This service provided as a courtesy
>     to the ruby-talk mailing list.  If this message is SPAM, its
>     ultimate origin is Usenet, not this gateway program.  All
>     subscribers to the ruby-talk mailing list agree to receive the
>     Usenet postings made to comp.lang.ruby via this gateway.  Please
>     see http://www.ruby-lang.org/ruby-talk-usenet-policy.html.

That URL is 404.