My 'D'M has a habit of sending nasty letters when someone upsets her. She won't just send them to the person who upset her, but also to their partner/friends/boss, anyone in their social circle, bitching about how she has been wronged etc. She is often very unpleasant. She puts 'Without Prejuduce' at the top of the letter as she believes this means that the letters can't be used in court and she can't get into trouble for harassment.
Is this true?