Hi,

Currently my code looks like this

void SendClick(object sender, EventArgs e)
                {
                        string un = uname + "@" + address;
                        string ipa = "IP address sent from : " + ip.Text;
                        StreamWriter sw = new StreamWriter(@"h:/test.txt");
                        sw.WriteLine(name);
                        sw.WriteLine(un);
                        sw.WriteLine(mess);
                        sw.WriteLine(ipa);
                        sw.Close();
                        
                        MailMessage mail = new MailMessage();
                        mail.To.Add("[email protected]");
                        mail.From = new System.Net.Mail.MailAddress(un);
                        mail.Subject = "A quick test";
                        mail.Body = "Just a quick test to make sure this works";
                        mail.Attachments.Add(new Attachment(@"h:/test.txt")); 
                        System.Net.Mail.SmtpClient smtp = new
System.Net.Mail.SmtpClient("mail.gmx.com");
                        smtp.EnableSsl = true;
                        smtp.Credentials = new 
System.Net.NetworkCredential("[email protected]",
"password");
                        try
                        {
                                smtp.Send(mail);
                        }
                        catch (System.Net.Mail.SmtpException ex)
                        {
                                MessageBox.Show(ex.Message.ToString(), 
"Ouchy!!!",
MessageBoxButtons.OK);
                        }
                }

This should work happily, but I always get an error thrown -

"Mailbox unavailable. The server response was 5.7.0 Sender address does not
belong to logged in user {mp-eu001}"

According to the docs for gmx, I'm doing this correctly.

Is my code wrong or is there something else I need to do for gmx to play
ball?

Thanks

Paul
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