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PHP, verify email address and IP address using filter_var - YouTube
Building a simple contact form in PHP - Part 3 | The Dev Files
How to Validate (and Sanitize) User Input In PHP Using Filter_Input() and Filter_Var() | by John Morris | Medium
GitHub - stymiee/email-validator: The Email Validator library builds upon PHP's built in `filter_var($emailAddress, FILTER_VALIDATE_EMAIL);` by adding a default MX record check. It also offers additional validation against disposable email addresses ...
PHP Mail Injection Protection and E-Mail Validation - A Beginner's Tour - CodeProject