As I have said time and time again NO. This forum has a wonderful feature called search. A search would reveal several threads where people have asked the exact same question.
Yup good answer Auron, I'm sure I would of thought of it eventually. I don't believe there is a code for ! though except maybe & #33; without the space (Stupid forum). I'm still going to look into it though as the default censor mssage ends in a ! as well.
I could but the requested feature would require some major work. Not only would it require emailing the admin upon receipt of an entry I would also need to make a section in the admin for them to review the posts waiting for acceptance. As you can tell the guestbook to email you on new postings it would be easier to just delete any unwanted posts as they are made.
Does the guestbook send you the posts details in the emails or is that something I added to my own?