If you look at your site's log files (the records kept by the server on who accessed what and when) and compair them to the time of the guestbook posts, then you should be able to find the guys IP address.
If your hosting control panel has the feature, you can then block them using the IP address. Failing that, if you are hosted on a linux/Apache based web server, then you can use .htaccess files to block certain IP addresses form your site. The contents of your .htaccess file would look like this
Code:
order allow,deny
deny from 123.321.123.321
allow from all
Else, ask your host for assistance. Tell them what from the abuse has taken and what the IP is and they may be able to help.
If you continue to have problems, try tracing the IP address back to the guys ISP. Make a report to them about their customer. Most ISPs will respond favorable as they don't like people blocking their IP addresses.
It should be noted that if you block an IP address form your site - you could be blocking an entire ISP or area from accessing your site. So if possible, only block from the key section of your site (e.g. the guesbook submission page) and keep the block on for just long enough for the trouble maker to move elsewhere. Don't leave it on forever.
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