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Pieces of information that the system adds to email messages from a PHP script on your server, which detail the script’s location. Enable these headers to help you locate insecure email scripts that spammers have abused. You can enable these headers in WHM's Tweak Settings interface (WHM >> Home  >> Server Configuration >> Tweak Settings).



An open-source microkernel-designed hypervisor that allows for many instances of an operating system or different operating systems to run on a single host at the same time. For more information, visit the Xen website.