$mail->Charset = 'utf-8';
$mail->Host = 'smtp.gmail.com';
$mail->SMTPAuth = true;
$mail->Username = 'email@gmail.com';
$mail->Password = 'senha';
$mail->From = 'email@gmail.com';
$mail->FromName = 'Eu';
$mail->SMTPDebug = 1;
$mail->SMTPSecure = 'ssl';
$mail->Port = 465;
$mail->Subject = 'Teste';
$mail->AddAddress('toemail@gmail.com', 'toemail');
$mail->MsgHTML("Segue em anexo o contrato");
$enviado = $mail->Send();
if ($enviado) {
    echo "ok";
} else {
    echo "erro";
}

- Resultado
SMTP -> ERROR: Failed to connect to server: (0)
SMTP Error: Could not connect to SMTP host. erro