Version: 1.12.3 (using KDE 4.3.3) OS: Linux Installed from: Gentoo Packages Message source showing in ISO-8859 encoding. Messages in 8 bit not ascii encoding incorrectly displayed.
Also as utf-8 messages. A little bit annoying.
I have the same problem in KMail 4.7.1. A message is in UTF-8 and is displayed correctly, but UTF-8 characters are garbage when message source is displayed.
Re comment #2: by "garbage" I mean for each multi-byte UTF-8 character, each byte seems to be displayed as an individual character, in ISO 8859-1 or 8859-2.
Thank you for taking the time to file a bug report. KMail2 was released in 2011, and the entire code base went through significant changes. We are currently in the process of porting to Qt5 and KF5. It is unlikely that these bugs are still valid in KMail2. We welcome you to try out KMail 2 with the KDE 4.14 release and give your feedback.