HttpClient: Post to php script not working

Im trying to send some data to a php script, the post request is made and I receive a response but the data does not seem to have been received.

C#

public static class Server
{
        public static string Adress = "http://ift.tt/1BT5bUt;;

        public static async Task<string> SendReport(string subject, string messageTxt, string messageHtml, byte[] attachment)
        {
                using (HttpClient httpClient = new HttpClient())
                {
                        MultipartFormDataContent content = new MultipartFormDataContent();
                        if (!string.IsNullOrEmpty(subject))
                                content.Add(new StringContent(subject), POST.Subject);
                        if (!string.IsNullOrEmpty(messageTxt))
                                content.Add(new StringContent(messageTxt), POST.MessageTxt);
                        if (!string.IsNullOrEmpty(messageHtml))
                                content.Add(new StringContent(messageHtml), POST.MessageHtml);
                        if (attachment != null && attachment.Length > 0)
                                content.Add(new ByteArrayContent(attachment), POST.Attachment);

                        HttpResponseMessage response = await httpClient.PostAsync(Server.Adress, content);
                        return await response.Content.ReadAsStringAsync();
                }
        }
}

static class Program
{
        static void Main(string[] args)
        {
                Console.Write(Server.SendReport("Test", "Message (Text)", "Message (Html)", new byte[] { 0, 1, 0, 1, 1 }).Result);
                Console.ReadKey();
        }
}

PHP

<?php print_r($_POST); ?>

The PHP-script says that $_POST is an empty array. What am I doing wrong? Im new to web/http interaction and completly new to php..

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http://ift.tt/Nw4Hjs