This month, we’ll reach over 70Gb of transfer on our server. This is a problem since most of it is due to bad spiders. Robots trying to get emails off our websites.
So, we had to install an Apache security module called ModSecurity to prevent such attacks. It is sad that we have to take such measures for bad coders prevention.
If you also have an Apache server and want to protect your system, look at this website: https://www.modsecurity.org/