* tinymce has some issues (especially in the IE department), enable only if you can take it

config/main.inc.php.dist

@@ -256,7 +256,7 @@ $rcmail_config['dst_active'] = (bool)date('I');
 $rcmail_config['prefer_html'] = TRUE;
 
 // compose html formatted messages by default
-$rcmail_config['htmleditor'] = TRUE;
+$rcmail_config['htmleditor'] = FALSE;
 
 // show pretty dates as standard
 $rcmail_config['prettydate'] = TRUE;