The Packbats' Weblog

...are a toxic mix, for unknown reasons - the third causes the second to crash the first. Forum thread here - the short version is, "go into Mail's Preferences, and in the GrowlMail pane set Notifications to 'Show a summary of received emails'. Or uninstall Safari 4."

Edit: Courtesy of codeman38 at macintosh, a third way: go into the GrowlMail pane and delete the line in the "Description:" box which says %body.