Version: 1.10.0 (using 4.1.00 (KDE 4.1.0), Arch Linux) Compiler: gcc OS: Linux (i686) release 2.6.25-ARCH KMail should remember the setting "HTML display" for particular mails - or even better: for particular senders. Additionally, most HTML mails make use of images and in the next step one can also enable "display images in HTML mail". Please also remember this setting per mail or per sender. Note that this bug report might be related to #53178 and #56950.
Bug already reported, see the bugs you mentioned and bug 63780.