Your server surely rejects relaying. See http://www.systemnetmail.com/


>Hi
>I am trying to send a email from .NET it seems to work but nothing happens. After several minutes I get the message
>“your email message was unable to be sent because your email server rejected the sender”
>

>   public void SendEmail()
>        {
>
>        MailMessage mail = new MailMessage();
>      mail.From = new MailAddress("fromName@btopenworld.com");
>      mail.To.Add("toName@btopenworld.com");
>      mail.Subject = "hi from stuart ";        	
>      mail.Body = "This is the main message";
>SmtpClient smtp = new SmtpClient("mail.btinternet.com");
>      smtp.Credentials = new NetworkCredential("myUserName@btopenworld.com", "myPassword");
>      smtp.Send(mail);
>
>        }
>

>
>The user name and passwords are correct
>What am I doing wrong?
>TIA
>Stuart