asp.net – System.Net.Mail.SmtpFailedRecipientException：不

System.Net.Mail.SmtpFailedRecipientException：不允许使用邮箱名称.服务器响应是：抱歉,该域不在我的System.Net.Mail.SmtpClient.Send(MailMessage消息)中允许的rcpthosts(#5.7.1)列表中

有没有什么办法解决这一问题？

如果我们必须在允许的rcphosts列表中添加此域,那该怎么办呢？

编写的代码是这样的：

MailMessage message;
bool success;
message = new MailMessage(from,to);
Attachment file;
SmtpClient lclient;


lclient = new SmtpClient("mail.domain1.com",587);
lclient.EnableSsl = false;

message.Body = body;
message.BodyEncoding = System.Text.Encoding.UTF8;
message.IsBodyHtml = true;
message.Subject = subject;
message.SubjectEncoding = System.Text.Encoding.UTF8;

lclient.SendCompleted += new 
SendCompletedEventHandler(SendCompletedCallback);
lclient.UseDefaultCredentials = false;
lclient.Credentials = new NetworkCredential(userID,password);
try
{

  lclient.Send(message);
  success = true;
  if (message != null)
      message.Dispose();
  success = true;
  return (success);
}
catch (Exception ex)
{  
    //...
}

谢谢