I don’t know if this will work for everyone, but I found a post in a forum which listed the IP addresses of known Trackback spammers. Since I added these to the list of IP addresses I already had, my trackback spam has fallen to a more manageable level.I know that this method isn’t a permanent solution as addresses change/more spammers emerge, but if you are desperate and need a reduction right now in Trackback spam then try entering these addresses:
12.180.174.2 24.79.91.1 59.167.72.235 65.28.141.9 68.44.20.93 68.92.13.130 80.237.140.233 83.23.9.195 83.23.21.164 83.23.44.43 141.154.155.69 148.244.150.57 148.244.150.58 192.195.100.42 200.30.79.126 207.248.240.118 207.248.240.119 209.202.64.250 210.245.164.201 211.58.36.71 212.31.118.137 212.193.63.1 218.188.19.132 220.227.147.92 222.146.35.80
