Send Error:不允许使用邮箱名称。 服务器响应为: You are not authorized to send mail, authentication is required

使用asp.net 2.0 中新的System.Net.Mail发送邮件，使用163邮件服务器时等其他服务器时可能会出现：“Send Error:不允许使用邮箱名称。 服务器响应为: You are not authorized to send mail, authentication is required”错误，以下程序中红色为特别需要主要的地方。 protected void Button1_Click(object sender, EventArgs e)
    ...{
        System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage();
        //收件人
        message.To.Add(txtMailAddress.Text);
        //抄送
        foreach(string mailAddress in txtCopyAddress.Text.Split(','))
        ...{
            if (!string.IsNullOrEmpty(mailAddress))
            ...{
                message.CC.Add(mailAddress);
            }
        }       
        //主题
        message.Subject = txtSubject.Text;

        message.From = new System.Net.Mail.MailAddress(fromAddress);
        message.Body = txtMailContents.Text;
        //发送附件
        if (fulAttachment.HasFile)
        ...{
            System.Net.Mail.Attachment attachment = new System.Net.Mail.Attachment(fulAttachment.PostedFile.FileName);
            message.Attachments.Add(attachment);
        }
        System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient(txtSMTPAddress.Text);
        smtp.Credentials = new System.Net.NetworkCredential(txtUserName.Text,txtPassword.Text);
       
        //smtp.usedefaultcredentials = true;
         
        try
        ...{           
            smtp.Send(message);
            lblReturnMessage.Text = "Mail Send Success!";
        }
        catch (System.Net.Mail.SmtpException ex)
        ...{
            lblReturnMessage.Text = "Send Error:" + ex.Message;
        }
     }
如果选择了163的SMTP服务器,“smtp.163.com”，发件人必须是登录用户的163 email用户地址。

System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient("smtp.163.com");
smtp.Credentials = new System.Net.NetworkCredential("163emailaddress","emailpassword");

System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage();
message.From = new System.Net.Mail.MailAddress("163emailaddress@163.com");

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/licerfordream/archive/2007/04/26/1586465.aspx