How to Prevent Email Injection in Your PHP Form to Mail Scripts

Nowadays, many websites no longer post their webmasters' email addresses, preferring instead to put up a contact or feedback form. Without the plethora of email addresses to harvest from websites, spammers have turned to using such feedback form scripts to send spam instead. If you are writing your own feedback form script, it is important that you write your script in such a way so as to prevent spammers from hijacking the script to spam others.

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