How important is it to consider DNS checks for validating email addresses in PHP forms?

It is important to consider DNS checks for validating email addresses in PHP forms because it helps ensure that the email address provided actually exists and is valid. This can help prevent fake or mistyped email addresses from being submitted, improving the overall quality of data collected from the form. 

// Validate email address using DNS check
function validateEmail($email) {
    if(filter_var($email, FILTER_VALIDATE_EMAIL)) {
        list($user, $domain) = explode('@', $email);
        return checkdnsrr($domain, 'MX');
    }
    return false;
}

// Example of how to use the validateEmail function
$email = "example@example.com";
if(validateEmail($email)) {
    echo "Email address is valid.";
} else {
    echo "Email address is invalid.";
}

Keywords

DNS checks email validation PHP forms MX records email verification

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