【请教】关于论坛账号激活

double1030

听朋友介绍来到这个论坛，本人最近想从美国捎个thinkpad回来，听朋友说这里的ecoupon挺多的，所以过来看看，注册个账号，需要激活，
邮箱收到的激活邮寄如下：
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Message-Id: <20110311005303.018F03059B20@51nb.com>
Date: Fri, 11 Mar 2011 08:53:02 +0800 (CST)

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b3J1bS8=

请问有好的办法进行编码转换么？
无奈这好自己写了个编码转换的程序……