Lately someone has been trying to leave spam on the comments to this blog. Problem for him, comments are not displayed until I moderate them. Second problem, such attempts are logged. My response:
iptables -A INPUT -s 18.104.22.168/28 -j DROP
Bigger problem for him, I can enable the spam filtering.
On the plus side, it means that my blog is being noticed; otherwise it wouldn’t be important enough to try and spam.