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From: Eli Zaretskii <eliz@is.elta.co.il>
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Subject: Re: RMAIL bails out with coding-system-error
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On 5 May 2002, David Kuehling wrote:

> 	     (insert "X-Coding-System: "
> 		     (symbol-name last-coding-system-used)
> 		     "\n")))
> [...]
> Using the last coding system is after all a little confusing.  Maybe
> `default-buffer-file-coding-system' would be a better (and more
> predictable) choice?

last-coding-system-used is set by all the functions that decode text.  So 
the above code makes sure the encoding of the message is recorded in the 
message headers.  That encoding can come from any number of sources: the 
Charset= header, the current defaults taken from the language 
environment, or from the user (see, e.g., rmail-redecode-body).  Perhaps 
I'm missing something, but I fail to see how any global default setting 
such as default-buffer-file-coding-system, can be an alternative to 
last-coding-system-used.