RSS de YahooGroups.
Testei. Aparentemente, funciona em qualquer grupo que deixa as mensagens públicas. Maravilha para diminuir o tráfego da caixa de entrada.
Peguei direto do Paolo Valdemarin:
Somehow I had totally missed this feature of Yahoo Groups. In the case that somebody else might have missed it too, if you submit:
http://groups.yahoo.com/group/Group_name/messages?rss=1
to your aggregator, you will get all posts submitted to that group in your favourite news reader.
Just subscribed to: http://groups.yahoo.com/group/klogs/messages?rss=1 and it works perfectly. Getting rid of more mail!