I can not send mail with PHPMailer on the server

require 'phpmailer/class.phpmailer.php';
require 'phpmailer/class.smtp.php';

$mail = new PHPMailer();
$mail->setLanguage('pt');

$from = '[email protected]';
$fromName = 'EmailServidor';

$host       = 'servidor.one.com';
$username   = '[email protected]';
$password   = '123456';
$port       = 587;
$secure     = false;

$mail->isSMTP();
$mail->Host         = $host;
$mail->SMTPAuth     = true;
$mail->Username     = $username;
$mail->Password     = $password;
$mail->Port         = $port;
$mail->Secure       = $secure;

$mail->From         = $from;
$mail->FromName     = $fromName;

$mail->addAddress('[email protected]', 'Usuario');

$mail->isHTML(true);
$mail->CharSet = 'utf-8';
$mail->WordWrap = 70;

$mail->Subject = 'Confirmação de Cadastro';
$mail->Body    = 'Email de teste.';
$mail->AltBody = 'Email de teste.';

$send = $mail->Send();

if($send)
    echo 'E-mail enviado com sucesso!';
else
    echo 'Error: '.$mail->ErrorInfo;

So I did the tests on localhost with Xampp and it worked, but when I went to test on the One.com server, it did not send the message and it also did not show any errors. Any idea what that might be?