System.Net.Mail.SmtpException: 事务失败。

[unstablellt]

System.Net.Mail.SmtpException: 事务失败。 服务器响应为: DT:SPM smtp2, DNGowKDL_gA6QwZNbZRvAQ--.617S2 1292256059 http://mail.163.com/help/help_spam_16.htm?ip=221.204.249.120&hostid=smtp2&time=1292256059
在 System.Net.Mail.DataStopCommand.CheckResponse(SmtpStatusCode statusCode, String serverResponse)
在 System.Net.Mail.DataStopCommand.Send(SmtpConnection conn)
在 System.Net.Mail.SmtpConnection.OnClose(Object sender, EventArgs args)
在 System.Net.ClosableStream.Close()
在 System.Net.Mail.MailWriter.Close()
在 System.Net.Mail.SmtpClient.Send(MailMessage message)
在 sendmail.smail()

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Mail;
using System.Threading;
using System.IO;
using System.Configuration;
using System.Text.RegularExpressions;
public class sendmail
{
    public sendmail()
    {

    }
    /// <summary>
    /// 邮箱的检查
    /// </summary>
    /// <param name="str"></param>
    /// <returns></returns>
    public static bool CheckEmailAdress(string str)
    {
        System.String ex = @"^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$";
        System.Text.RegularExpressions.Regex reg = new Regex(ex);
        bool flag = reg.IsMatch(str);
        return flag;
    }

    #region 邮件发送
    private string smtp;
    private string fjrtxt;
    private string fjrid;
    private string mmtxt;
    private string sjrtxt;
    private string zttxt;
    private string fjtxt="";
    private string nrtxt;
    private bool hz=false;
    private string hzyx;
    private string bcclist="";
    private string fjrname;
    /// <summary>
    /// //设置邮件协议
    /// </summary>
    public string Smtp
    {
        get
        {
            return smtp;
        }
        set
        {
            smtp = value;
        }
    }
    /// <summary>
    /// 发件人邮箱
    /// </summary>
    public string Fjrtxt
    {
        get
        {
            return fjrtxt;
        }
        set
        {
            fjrtxt = value;
        }
    }
    /// <summary>
    /// 发件人帐号
    /// </summary>
    public string Fjrid
    {
        get
        {
            return fjrid;
        }
        set
        {
            fjrid = value;
        }
    }
    /// <summary>
    /// 帐号密码
    /// </summary>
    public string Mmtxt
    {
        get
        {
            return mmtxt;
        }
        set
        {
            mmtxt = value;
        }
    }
    /// <summary>
    /// 收件人邮箱
    /// </summary>
    public string Sjrtxt
    {
        get
        {
            return sjrtxt;
        }
        set
        {
            sjrtxt = value;
        }
    }
    /// <summary>
    /// 主题
    /// </summary>
    public string Zttxt
    {
        get
        {
            return zttxt;
        }
        set
        {
            zttxt = value;
        }
    }
    /// <summary>
    /// 附件多个用|隔开
    /// </summary>
    public string Fjtxt
    {
        get
        {
            return fjtxt;
        }
        set
        {
            fjtxt = value;
        }
    }
    /// <summary>
    /// 邮件内容
    /// </summary>
    public string Nrtxt
    {
        get
        {
            return nrtxt;
        }
        set
        {
            nrtxt = value;
        }
    }
    /// <summary>
    /// 是否发送回执
    /// </summary>
    public bool Hz 
    {
        get {
            return hz;
        }
        set {
            hz = value;
        }
    }
    /// <summary>
    /// 回执接收邮箱
    /// </summary>
    public string Hzyx 
    {
        get { return hzyx; }
        set { hzyx = value; }
    }
    /// <summary>
    /// 邮件密抄送多个邮箱用 , 号隔开
    /// </summary>
    public string Bcclist 
    {
        get { return bcclist; }
        set { bcclist = value; }
    }
    /// <summary>
    /// 发件人
    /// </summary>
    public string Fjrname 
    {
        get { return fjrname; }
        set { fjrname = value; }
    }

    /// <summary>
    /// 邮件发送
    /// </summary>
    /// <returns>bool</returns>
    public bool smail()
    {
        bool b = false;
        SmtpClient client = new SmtpClient(smtp);
        client.UseDefaultCredentials = false;
        client.DeliveryMethod = SmtpDeliveryMethod.Network;
        client.Credentials = new NetworkCredential(fjrid, mmtxt);
        MailMessage mmsg = new MailMessage(new MailAddress(fjrtxt, fjrname), new MailAddress(sjrtxt));
        if(hz){
        mmsg.Headers.Add("Disposition-Notification-To", hzyx);
        }
        if(bcclist.Length>0)
        {
            foreach (string bccto in bcclist.Split(','))
            {
                if (bccto.Length > 0)
                {
                    mmsg.Bcc.Add(new MailAddress(bccto, bccto));
                }

            }

        }
        mmsg.Subject = zttxt;

        mmsg.SubjectEncoding = Encoding.UTF8;

        mmsg.Body = nrtxt;

        mmsg.BodyEncoding = Encoding.UTF8;

        mmsg.IsBodyHtml = true;

        mmsg.Priority = MailPriority.Normal;//邮件发送级别

        if (fjtxt.Length > 0)
        {
            foreach (string fj in fjtxt.Split('|'))
            {
                mmsg.Attachments.Add(new Attachment(fj));
            }
        }
        try
        {
            client.Send(mmsg);
            b = true;
        }
        catch(Exception ex) 
        {
                
            b = false;
        }        return b;
    }
    #endregion

}

[wanzhengcheng]

学习 标记

[unstablellt]

是由于 大量发送 163 的问题把邮箱禁用发送