On Wednesday November 02 2022 16:09:46 Masaru Nomiya wrote: >MN> There exits a bug in kmail, I think. > >I checked again and the problem is only with UTF-8 encoded emails, not >with Shift_JIS encoded e-mails. >There was a problem with the Shift_JIS email used for the check, but >the cause is still unknown. > >Anyway, I think the cause of the garbled characters is that Japanese >UTF-8 encoded e-mails are decoded in ISO-8859-1 (or ISO-Latin-1). You've done a reasonable amount of triaging so you should probably report this directly on BKO (bugs.kde.org). There are also mailinglists specific to KDEPIM where this is much more likely to be seen by someone of the dev team. R.