ActiveX – Automation Server Can’t Create Object

I have a web page from which I need to send an email to. I need to send a LARGE email from the browser. Because the content is larger than the query string allows, I need to rely on Active X. I want to send this email through Outlook. In an attempt to do this, I’ve written the following code:

try {
  var to = "";
  var cc = "";
  var subject = "Action Required";
  var body = GenerateEmailBody();

  var outlook = new ActiveXObject('Outlook.Application');
  var outlookNamespace = outlook.GetNameSpace('MAPI');

  var message = outlookNamespace.CreateItem(0);
  message.Display();
  message.To = to;
  message.Subject = subject;
  message.Body = body;
  message.GetInspector.WindowState = 2;
} catch (err) {
  alert("Unable to send email. " + err);
}

When I execute this code, I get the following error:

ReferenceError: ActiveXObject is not defined 

What am I doing wrong?

Thanks!