If you use recent SEMI-EPG, remove "(require 'mime-w3m)" and try the below code. (setq mime-view-text/html-previewer 'shr) Recent SEMI-EPG automatically loads w3m.el and mime-w3m.el when needed. Too early Loading mime-w3m.el by user may disable mime-view-text/html-previewer's effect. -- Kazuhiro Ito