How to specify the codepage for a portion of GBK encoded HTML file?

Hey, I found that elinks now could display HTML file with Content-Type
header set as "GBK" or "GB2312" properly, but how could I specify that
to display part of a GBK encoded file with no Content-Type header set?

The problem I have is that I intend to use elinks to dump HTML email to
text in mutt, and most of my emails are encoded in GBK or GB2312 without
the Content-Type header set, I can not find a way to tell elinks about
the encoding of these HTML emails.

I found a thread[1] that talked about displaying BIG5 encoded website,
any update on that?

[1]: http://thread.gmane.org/gmane.comp.web.elinks.user/1920
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