Error "SMTP Error: Could not connect to SMTP host." using PhpMailer

my code is:

try {

$mail = new PHPMailer(true);

$mail->IsSMTP();

$mail->Host = 'smtp.zoho.com';

$mail->SMTPAuth = true;

$mail->Port = 465;

$mail->SMTPSecure = 'ssl';

$mail->Username = '...';

$mail->Password = '...';

$mail->SetFrom('...', '...');

$mail->AddReplyTo('...', '...');

$mail->Subject = '...';

$mail->AddAddress($email, $apelido);

$mail->MsgHTML($html);

$mail->Send();

}catch (phpmailerException $ex) {

echo $ex->errorMessage();

}

can any one help me?

thanks!