Sending Automated Emails asynchronously using a C# Windows Service

Hi Experts,

I've been following the linked tutorial which provides instruction on how to set up a service to send emails asynchronously using names, email-addresses & dates stored in a database.
I have built the solution and installed the service on my local machine, the only significant difference between my project and the authors is that I want to send my mail through our exchange server whereas the author has used a gmail account.

If We look at the main email Method (below) I am seeing the Message Sent SUCCESS message in the event log for the service and it has correctly picked up my email address and name from the database as 'CustomerEmail' and 'CustomerName', So I presume that I am 99% there, what I don't get is the actual physical email arrive in my Inbox.....can anyone suggest where I might begin troubleshooting?

Someone else seemed to have similar trouble following the tutorial and the author suggested an SMTP problem and to check ports and settings...however all that is set in the project itself is a sever name and credentials - in our case we use these credentials to send out batch html emails via a console app so I am fairly confident that these are correct.

I am wondering if the fact that I am using a Windows service to send the email is seen as a security threat by our exchange server or something...but I've never done this before so really haven't a clue...

private void ServiceEmailMethod()
        {
            eventLogEmail.WriteEntry("In Sending Email Method");

            EmailComponent.GetEmailIdsFromDB getEmails = new EmailComponent.GetEmailIdsFromDB();
            getEmails.connectionString = ConfigurationManager.ConnectionStrings["CustomerDBConnectionString"].ConnectionString;
            getEmails.storedProcName = "GetBirthdayBuddiesEmails";
            System.Data.DataSet ds = getEmails.GetMailIds();

            EmailComponent.Email email = new EmailComponent.Email();

            email.fromEmail = "example@gmail.com";
            email.fromName = "example Name";
            email.subject = "Birthday Wishes";
            email.smtpServer = "smtp.gmail.com";
            email.smtpCredentials = new System.Net.NetworkCredential("example@gmail.com", "example password");

            foreach (System.Data.DataRow dr in ds.Tables[0].Rows)
            {
                email.messageBody = "<h4>Hello " + dr["CustomerName"].ToString() + "</h4><br/><h3>We Wish you a very Happy" +
                                    "Birthday  to You!!! Have a bash...</h3><br/><h4>Thank you.</h4>";

                bool result = email.SendEmailAsync(dr["CustomerEmail"].ToString(), dr["CustomerName"].ToString());

                if (result == true)
                {
                    eventLogEmail.WriteEntry("Message Sent SUCCESS to - " + dr["CustomerEmail"].ToString() +
                                             " - " + dr["CustomerName"].ToString());
                }
                else
                {
                    eventLogEmail.WriteEntry("Message Sent FAILED to - " + dr["CustomerEmail"].ToString() +
                                             " - " + dr["CustomerName"].ToString());
                }

            }
        }

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