smtp服务认证问题？？？

Question

在SmtpMail.Send(message);之前加上以下几句：
message.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate","1"); 
message.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername",username);   //message.From
message.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword",password);    //message.From的密码
SmtpMail.SmtpServer=smtpServer;//如："smtp.126.com"; 必须与message.From 的邮箱一致。

Answer 1

需添加lblTips（Label）控件，程序目录下需有Data.xls文件using System.Web.Mail;
using System.Runtime.InteropServices;
using CDO;private void SendMail()
{
    System.DateTime dtNow = System.DateTime.Now;
    MailAttachment ac = new MailAttachment("Data.xls");
    MailMessage Message = new MailMessage();    lblTips.Text = "正在发送邮件...";
    lblTips.Left = (this.Width - lblTips.Width) / 2;
    lblTips.Refresh();    try
    {
        Configuration conf = new ConfigurationClass();        conf.Fields[CdoConfiguration.cdoSendUsingMethod].Value = CdoSendUsing.cdoSendUsingPort;
        conf.Fields[CdoConfiguration.cdoSMTPServer].Value = "***.***.***.***";
        conf.Fields[CdoConfiguration.cdoSMTPServerPort].Value = 25;
        conf.Fields[CdoConfiguration.cdoSMTPAccountName].Value = "Account";
        conf.Fields[CdoConfiguration.cdoSendUserReplyEmailAddress].Value = "\"Account\" <[email protected]>";
        conf.Fields[CdoConfiguration.cdoSendEmailAddress].Value = "\"Account\" <[email protected]>";
        conf.Fields[CdoConfiguration.cdoSMTPAuthenticate].Value = CdoProtocolsAuthentication.cdoBasic;
        conf.Fields[CdoConfiguration.cdoSendUserName].Value = "Account";
        conf.Fields[CdoConfiguration.cdoSendPassword].Value = "Password";        conf.Fields.Update();        MessageClass msg = new MessageClass();
        msg.Configuration = conf;        msg.AddAttachment(System.Windows.Forms.Application.StartupPath+"\\Data.xls","","");
        msg.To = "MailTo";
        msg.From = "MailFrom";
        msg.Subject = dtNow.Year.ToString() + "年" + dtNow.Month.ToString() + "月";
        msg.HTMLBody = "请查收附件！";        msg.Send();        lblTips.Text = "邮件发送完成...";
        lblTips.Left = (this.Width - lblTips.Width) / 2;
        lblTips.Refresh();
    }
    catch (System.Runtime.InteropServices.COMException eLoad)
    {
        lblTips.Text = "邮件发送失败...";
        lblTips.Left = (this.Width - lblTips.Width) / 2;
        lblTips.Refresh();
    }
}

Answer 2

这句好像是不必要的：
MailAttachment ac = new MailAttachment("Data.xls");hoho~~~，不好意思~~~