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hello and welcome to secure code Barrios in this module weamp;#39;ll be looking at email header injection will explain what email header injection is its causes and Preventionamp;#39;s and some potential hazards so what is email header injection in applications that allow users to type and send mails email header injections are where users are able to craft parameters that cause additional mail headers to be added when constructing the mail what causes email header injection these vulnerabilities occur when user input is sent to the server without verification against a whitelist or first filtering the data the users data can contain sequences of characters that modify the passing logic to understand email header injection vulnerabilities letamp;#39;s look at an example here a web application allows users to ask questions through a contact form the mail address where questions are sent to remains a mystery an example of raw output for a filled in form can be seen below as you can se