Broken received emails

Question

I'm getting email with attachments by simple IMAP client:

class Program
{
    static StreamWriter sw = null;
    static TcpClient tcpc = null;
    static SslStream ssl = null;
    static string path;
    static StringBuilder sb = new StringBuilder();
    static byte[] dummy;
    string username = "user";
    string password = "pass";

    static void Main(string[] args)
    {
        try
        {
            path = Environment.CurrentDirectory + "\\emailresponse.txt";

            if (System.IO.File.Exists(path))
                System.IO.File.Delete(path);

            using (sw = new System.IO.StreamWriter(System.IO.File.Create(path)))
            using (tcpc = new System.Net.Sockets.TcpClient("imap.server.com", 993))
            using (ssl = new System.Net.Security.SslStream(tcpc.GetStream()))
            {
                ssl.AuthenticateAsClient("imap.server.com");
                receiveResponse("");                    
                receiveResponse("$ LOGIN " + username + " " + password + "\r\n");
                Console.WriteLine("enter the email number to fetch :");
                int number = int.Parse(Console.ReadLine());
                receiveResponse("$ FETCH " + number + " body[header]\r\n");
                receiveResponse("$ FETCH " + number + " body[text]\r\n");
                receiveResponse("$ LOGOUT\r\n");
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.ToString());
        }
    }

    static void receiveResponse(string command)
    {
        try
        {
            if (command != "")
            {
                if (tcpc.Connected)
                {
                    dummy = Encoding.Default.GetBytes(command);
                    ssl.Write(dummy, 0, dummy.Length);
                }
                else
                {
                    throw new ApplicationException("TCP CONNECTION DISCONNECTED");
                }
            }
            ssl.Flush();
            byte[] bigBuffer = new byte[1024*18];
            int bites = ssl.Read(bigBuffer, 0, bigBuffer.Length);
            byte[] buffer = new byte[bites];
            Array.Copy(bigBuffer, 0, buffer, 0, bites);
            sb.Append(Encoding.Default.GetString(buffer));
            sw.WriteLine(sb.ToString());
            sb = new StringBuilder();
        }
        catch (Exception ex)
        {
            throw new ApplicationException(ex.ToString());
        }
    }
}

Everything is alright, but if email size is more than ~19kb, content is cropped regardless of buffer size. How to fix it?

Answer 1

Solution is that I have to repeat request receiveResponse("$ FETCH " + number + " body[text]\r\n") till I get all data pieces. And problem was that I did loop inside receiveResponse instead of main block.