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From: CHENG Gao <chenggao@gmail.com>
Newsgroups: gmane.emacs.gnus.user
Subject: Re: How to post articles in different charset for different group?
Date: Fri, 27 May 2005 22:49:30 +0800
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Maybe *Group Parameter* helps.

Say 

 "regexp for chinese groups" (charset . gb2312) ...

Did not test it myself. You can consult Gnus manual.