Advanced Guestbook Question

Good Morning everyone.

I am using the 2.4.1 version and I have person who is signing my guestbook insulting one of my visitor and talking bad about him. I already corrected the flood check so he won't be able to post more than one within 24 hours, I also went to the banner option and typed his IP but seems his ISP is giving him dinamic IPs so it change all the time. I did entered the first three numbers of his IP but that will lock any other person with almost the same ip address at least beginig with 68.38. etc.
My question is:

Is there an option that when people sign my guestbook whatever they wrote go to my e mail, I check it and then publish it later if it is a good one?.

In case that option doesn't exist, would that be a future option?.

I am asking cause a friend of mine told me that he knew about a guestbook who does that.

Please I need help.
Thanks in advance

Most ISPs will assign you a different IP everytime you connect.

Lazarus lets you premoderate all entries before they appear in the guestbook.