Setting mailServerName in C# .Net for email feedback form

Hi

I'm writing an application that has a html feedback form included. I am trying to send the information back through email but am having difficulty when setting the MailServerName.
 
This is the code I am using

private void SendMail(string from, string body)
    {
        string mailServerName = "smtp.MyServerName.com";
        MailMessage message = new MailMessage(from, "test@test.com", "feedback", body);
        SmtpClient mailClient = new SmtpClient();
        mailClient.Host = mailServerName;
        mailClient.Send(message);
        message.Dispose();
    }

The error that I am getting when I run the script is "SmtpException was unhandled by User code - Failure Sending Mail" and it points to the line mailClient.Send(message);

So I figure it is having trouble when I am putting in the ServerName, I'm new to this, is there anyway I can change this around to take the IP address instead to see if that works?
IRLWEBAsked:
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McExpConnect With a Mentor Commented:
See below for some sample code, it sends an email via an account which requires authentication: -

            System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();

            //set the addresses
            mail.From = new System.Net.Mail.MailAddress("errorMgr@MySite.com");
            mail.To.Add("TestUser@SomeSite.com");
            mail.Subject = "The Subject";
            mail.Body = "This is the messsage Body;

            System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient("mail.MySite.com");
            //Alternativly you can use an IP address
            //System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient("192.168.11.1");
            smtp.Credentials = new System.Net.NetworkCredential("errorMgr@MySite.com", "errorMgr");
            smtp.Send(mail);
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