Fight against wordpress spam - Rename wp-comments-post.php
Many spambots simply hit the wp-comments-post.php and wp-trackback.php files directly, without scanning your site to find the real names of these scripts. You can foil such bots by renaming these files.
Renaming wp-comments-post.php
Let’s say you want to rename your file wp-comments-yourdomain.php.
Back up all your files.
Replace all instances of wp-comments-post.php in your theme template files [...]