Hi

Try after removing the following line of code:

mySmtpClient.Port = 587;

If it does n't work, try using the port 465.

Also, remove the settings in the web.config. Folllowing is the sample code that sends a simple email using Gmail smtp, it is in VB but you can surely have an idea:

            Dim mm As New MailMessage()
            mm.To.Add("toAddress")

            mm.From = New MailAddress("FromAddress")
            mm.Subject = "Test Subject"
            mm.Body = "Message Details"

            Dim ss As New SmtpClient("smtp.gmail.com")
          
            ss.Credentials = New System.Net.NetworkCredential("username","password")

            ss.EnableSsl = True

          
            ss.Send(mm)
          

The above code will work, if you are not behind a proxy and directly connected to the internet.