What are some security considerations when implementing mass email functionality in PHP?

Issue: One security consideration when implementing mass email functionality in PHP is to prevent email injection attacks by properly sanitizing user input before sending emails. Solution: To prevent email injection attacks, you can use the `filter_var` function with the `FILTER_VALIDATE_EMAIL` filter to validate email addresses before sending emails. This helps ensure that only valid email addresses are included in the mass email functionality. 

$email = $_POST['email'];

if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    // Send email
} else {
    // Handle invalid email address
}

Keywords

SQL injection Cross-site scripting Email headers SMTP authentication Content filtering

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