Version: 1.11.4 (using 4.2.4 (KDE 4.2.4), Gentoo) Compiler: i686-pc-linux-gnu-gcc OS: Linux (i686) release 2.6.30 I sometimes receive email newsletters which are in HTML format. The newsletters from one specific sender are not shown in kmail, while Thunderbird shows them just fine. Kmail only shows a message from within the mail itself, telling me that my mail client is not capable of showing the real newsletter content. I can attach or forward an example mail if needed.
Just found out that if I enable "Prefer HTML over plain text", the newsletters are shown correctly.