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PHP tutorial code for the email verification tutorial on
require dirname(__FILE__).'/smtp-validate-email.php';
$from = '';
if (!$db = new mysqli('localhost', 'username', 'password', 'databasename')) {
die('Can\'t connect to the database.');
} else {
// after I imported all email addresses into the data I select 25 records for validation
$res = $db->query("SELECT ID, email FROM emailaddresses WHERE status = 'valid' ORDER BY RAND() LIMIT 25");
while ($obj = $res->fetch_object()) {
$status = 'invalid';
$address = trim($obj->email);
// filter for a valid email format
if( filter_var( $adres, FILTER_VALIDATE_EMAIL ) ) {
$domain = array_pop(explode('@', $address));
// check for existing MX records
if (checkdnsrr($domain, 'MX')) {
// use the validator class to connect via SMTP
$validator = new SMTP_Validate_Email($address, $from);
$smtp_results = $validator->validate();
if ($smtp_results[$adres]) {
$status = 'valid';
// update the new status, otherwise you will check your records for years :)
$db->query(sprintf("UPDATE emailaddresses SET status = '%s' WHERE ID = %d", $status, $obj->ID));
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