misconversion (mojibake) of some mails in Japanese
misconversion (mojibake) does not happen when a mail header is as below. Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: base64
misconversion (mojibake) happens when a mail header is as below. Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit
It seems encoding in my Thunderbird does not match 8bit. Several years ago Thunderbird had an option to modify text encoding but I cannot find such an option in the recent versions. It would be really appreciated if anyone help. Thank you.
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The following link might be helpful: https://support.mozilla.org/en-US/questions/1552171#answer-1783787
Thank you for your suggestion. I tried it but unfortunately it does not work...
I think this problem is caused by a sender and by a receiver separately. At least a mail from a sender with encoding by base64 does not cause this problem. And there is a receiver who can read a mail without misconversion (mojibake) even if encoded by 8bit. I would like to know the latter case in detail.