which encode to read the archives?

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I am a newer of Debian (and Linux) and now i encounted a problem:
I can't read the arhives at http://lists.debian.org/debian-chinese-gb/
I get terrible lists as follow:

• =?gb2312?b?UmU6IMjnus7No9PDSVBWNg==?= hiei
• Re: =?gb2312?b?09C40NPauNW/tLXE0ru49sz719OjrMfrvczSu8/Co/ej5aPitcQ=?==?gb2312?b?sLLIq9DU?= Weiming Yin
• =?gb2312?b?UmU6IGRlYmlhbsDv09BXWVNJV1lHtcRkb2Nib29rseC8rcb3w7Sjvw==?= Huang Jiahua
• Re: ååéåäèåèæåèçï RanXiaodong
• =?gb2312?b?ZXhpbTTU9cO0xeTWwz8=?= =?gb2312?b?cmVueGlhb2xlaTg0?=
• Re: ProZilla èäDebianéåéï Xie Yanbo
• =?gb2312?b?UmU6IM/W1Np3aW5lxNyyu8Tc1MvQ0G1zIG9mZmljZQ==?= Fen Lu
  • Re: =?gb18030?b?z9bU2ndpbmXE3LK7xNzUy9DQbXM=?= office =?gb18030?q?=C1=F5=CA=C0=CE=B0?=
• =?gb2312?b?UmU6IGRlYmlhbsDvw+bU9cO0suy/tLSuv9q1xMq508PH6b/2sKGjvw==?= =?gb2312?b?cmVueGlhb2xlaTg0?=
  • =?gb2312?b?UkU6IGRlYmlhbsDvw+bU9cO0suy/tLSuv9q1xMq508PH6b/2sKGjvw==?= Li Weichen
• =?gb2312?b?dGZ0cLXEyNXWvsrHxMS49s7EvP6jvw==?= Li Weichen

I have changed the encode to both gb2312, gbk, utf-8, big5, but nothing is available.
my explorer is firefox 1.5, and my locale is set to zh_CN.UTF-8.
help me! 3ks.