PHP tutorial code for the email verification tutorial on www.tutdepot.com.

tutorial-code.php

<?php
require dirname(__FILE__).'/smtp-validate-email.php';

$from = 'your@emailaddress.com';

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));	
	}
	$db->close();
}