$server = 'yourmailserver';
$user   = 'youraccount';
$pass   = 'yourpassword';
$port   = \Mattioli\EmailReader\Defs\EmailPort::POP;
$type   = \Mattioli\EmailReader\Defs\EmailType::POP;

$email = new \Mattioli\EmailReader\EmailReader(
	new \Mattioli\EmailReader\EmailConfig(
		$server, $user, $pass, $port, $type
	)
);
$inbox = $email->get_inbox();
print_r($inbox);