For sure it looks like the 'quoted printable' encoding. There are perl modules for working with it: QuotedPrint. I think the Content-Type is just not correct, but I might be wrong.

Update: I've found there is another header for this: Content-Transfer-Encoding. From RFC 2045: 

6.1.  Content-Transfer-Encoding Syntax

   The Content-Transfer-Encoding field's value is a single token
   specifying the type of encoding, as enumerated below.  Formally:

     encoding := "Content-Transfer-Encoding" ":" mechanism

     mechanism := "7bit" / "8bit" / "binary" /
                  "quoted-printable" / "base64" /
                  ietf-token / x-token

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In reply to Re: Norwegian letters problem by zby
in thread Norwegian letters problem by Kjetil

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