Cannot send SMTP mail from a Windows service to Win7

Question

I am writing a Windows service using C # .NET 4.0 (my development workstation is Windows 7). The goal is to send an email from the service directly in case of errors during processing. I included a code snippet to show what I'm trying to achieve:

try
        {
                string emailAddresses = "[e-mail]";
                string emailCCAddresses = "[e-mail]";

                //Send the email
                using (MailMessage mailMsg = new MailMessage())
                {
                    mailMsg.To.Add(emailAddresses);
                    mailMsg.From = new MailAddress("[e-mail]");
                    mailMsg.CC.Add(emailCCAddresses);
                    mailMsg.Subject = " Error Message ";
                    mailMsg.Body = DateTime.Now + " : Invalid File Encountered." ;

                    ////Creating the file attachment
                    using (Attachment data = new Attachment("C:\\users\\sample.xml", MediaTypeNames.Application.Octet))
                    {
                        //Add timestamp info for the file
                        ContentDisposition disposition = data.ContentDisposition;
                        disposition.ModificationDate = File.GetLastWriteTime("C:\\users\\sample.xml");
                        mailMsg.Attachments.Add(data);

                    SmtpClient emailClient = new SmtpClient("example.Sample.com", 25);
                    emailClient.DeliveryMethod = SmtpDeliveryMethod.Network;
                    emailClient.UseDefaultCredentials = true;
                    emailClient.Send(mailMsg);
                    }
                }//end using

            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }

The problem I encountered is an email option that does not work from the win service on any Windows 7 computer. However, the same code will work fine on a Win XP machine. Caveat, this cannot be verified as a console application. It must be running as a service in order to see the behavior. I put the same code in a console application and it worked perfectly on my machine with win 7.

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