My locale is zh_TW.Big5. Surely I often receive mail encoded in big5.

Mutt does a good job in decoding the Chinese text in Subject and From,
which appears rawly as "=?big5?B?........=?=" (base64. quoted-printable
OK, too).

But I found mutt doesn't decode them if such encoding happens at
attachment.

    Content-Type: image/gif;
        name="=?big5?B?pN+4Zy5naWY=?="
    Content-Transfer-Encoding: base64
    Content-Disposition: attachment;
        filename="=?big5?B?pN+4Zy5naWY=?="

I did experiments and sent me a file in attachment with Chinese
filename. Mutt displays OK. But it uses a different and strange
encoding:

    ontent-Type: text/html; charset=big5
    Content-Disposition: attachment;
        
filename*=big5''%A6p%A6%F3%BF%EF%A4%40%B1i%A6n%A7%C9%AD%DD%BD%CD%BA%CE%AB%BA%2Ehtm
    Content-Transfer-Encoding: 8bit

What's the matter?

best regards,
charlie

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