From what I can see there’s no method to do this that’s already built in but if you comment out the line that reads:
$this->post['comment_content'] .= "<!-- X-spaminator-passed: $how -->";
It should remove those bits.
Bah it looks like the line wrapped, it should be one line, line 489 in my text editor.
Your milage may vary of course.
Ante
