Created attachment 103310 [details] Screenshot of message viewer In openSUSE Tumbleweed, Noto Sans CJK SC is the default Simple Chinese font. It is special because it provide extra thin fonts. When KMail renders the message, Chinese text will be rendered with thin fonts, but Latin text will use regular fonts. This only affect the message viewer, not other UI. For example, message list use regular fonts, not thin fonts. Also, it won't affect Latin text, which use Noto Sans fonts providing thin fonts, too. Not sure if this is the problem of HTML render engine or Noto Sans CJK fonts.
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This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!