BUG: .NET 4.0 (System.Net.Mail) Unable to send emails with large attachments (more than 3MB)

This is probably the first bug reported by customer so far for System.Net.Mail Class in .NET 4.0 Framework, or at least the first one I worked on. This was pretty straight forward repro and I did not had to do much to reproduce the issue locally. static void Main(string[] args)        {            SmtpClient client = new SmtpClient("contoso_smtp_server");            client.Credentials = new