since few days, someone is sending thousands of request to a wordpress website hosted on my webserver.
A generic log line for this request is:
18.104.22.168 - - [23/Nov/2013:18:24:46 +0100] "GET /archivio/mgilbert/ HTTP/1.0" 200 24758 "http://www.**********.it/archivio/mgilbert/#comment-9768++++++++++++Result:+chosen+nickname+%22Tiedimmox%22;+nofollow+is+found;+success+%28from+first+page%29;+BB-code+not+working;" "Mozilla/5.0 (Windows NT 5.1; rv:15.0) Gecko/20100101 Firefox/15.0.1
As a result of this request, the owner of the website is receiving tons of emails. Request comes from different IP addresses, so I can't block them using IP address as filter.
Is there any way to block such requests?