[DotNetDevelopment] Trying to send email from ASP.NET C# Application

[stapes]

Hi

I am trying to send emails using the following method:

protected void Button1_Click(object sender, EventArgs e)
    {
        // this method of sending emails comes from
http://weblogs.asp.net/nawaf/archive/2007/12/07/sending-email-in-c-sync-async-multiple-recipients-attachments-etc.aspx

        //string from = "[EMAIL PROTECTED]";
        string from = "[EMAIL PROTECTED]";
        string to = "[EMAIL PROTECTED]";
        string subject = "Email from EMMA";
        string messageBody = "The quick brown fox";
        Attachment attachmnts=null ;
        SendAsync(from, to, subject, messageBody, attachmnts);

    }
    private delegate void SendMailMethod(SmtpClient smtpClient,
MailMessage message);
    public static void SendAsync(string from, string to, string
subject, string messageBody, params Attachment[] attachments)
    {
        try
        {
            Send(from, new string[] { to }, subject, messageBody,
true,
                delegate(SmtpClient smtpClient, MailMessage message)
{ smtpClient.SendAsync(message, DateTime.Now.ToString()); },
attachments);
        }
        catch (Exception Ex) { CIOS.Utils.MsgBox(Ex.ToString()); }
    }
    private static void Send(string from, string[] to, string subject,
string messageBody, bool isBodyHtml, SendMailMethod sendDelegate,
        params Attachment[] attachments)
    {

        SmtpClient emailClient;
        try
        {
            emailClient = new SmtpClient("checkitout.co.uk");
            MailMessage message = new MailMessage();
            message.Subject = subject;
            message.Body = messageBody;
            message.Sender = new MailAddress(from);
            foreach (string address in to)
                message.To.Add(new MailAddress(address));
            message.IsBodyHtml = isBodyHtml;
            message.BodyEncoding = System.Text.Encoding.UTF8;
            message.SubjectEncoding = System.Text.Encoding.UTF8;
            //if (attachments != null)
            //{
            //    foreach (Attachment attchment in attachments)
            //        message.Attachments.Add(attchment);
            //}
            //emailClient.UseDefaultCredentials = true;
            emailClient.Credentials =
System.Net.CredentialCache.DefaultNetworkCredentials;

            sendDelegate(emailClient, message);
            CIOS.Utils.MsgBox("Message Sent");
        }
        catch (Exception ex)
        {
            CIOS.Utils.MsgBox(ex.ToString());
            throw new Exception("Unable to send email");
        }
    }

The whole thing appears to run OK and the system responds with
"Message Sent". However, the message has not been sent. This is a bit
crap. Why does it say it has worked when it hasn't?

I am using Visual Studio 2005, and IIS version 5.1

Any ideas how I can get this to work?