Let’s take a look at a PHP script used to send spam. These types of scripts run on servers all over the world and might give you some insight into a spammer’s dedication to annoy the hell out of you. ... One of the WordPress sites on a shared hosting web server I manage was infected by a spam script. Fortunately, the script was unable to do any real damage and was detected within half an hour of infection. I thought it would be fun to show you the script and dissect it, to find out exactly how these things work and make thousands of email administrators’ lives a living hell.
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