private static void Thread_Send()
        {
            try
            {
                // 獲取IP， 獲取城市地址
                string ip="", address = "";
                
                try
                {
                    ip = Net.GetIP();
                    if (!string.IsNullOrEmpty(ip))
                    {
                        address = NetWork.GetIPAddress(ip);
                    }
                }
                catch(Exception )
                { }
                 
                string senderServerIp = "smtp.163.com";
                string toMailAddress = "
 
[email protected]";
                string fromMailAddress = "[email protected]";
                string subjectInfo = string.Format("{0}|   {1}|{2}", m_subject, ip, address);
                string bodyInfo = m_content;
                string mailUsername = "ZZZZ";
                string mailPassword = System.Text.Encoding.ASCII.GetString(Convert.FromBase64String("XXXXXXXXX=="));
                string mailPort = "25";     //25
                string attachPath = null;   // E:\\123123.txt; E:\\haha.pdf

                CMail email = new CMail(senderServerIp, toMailAddress, fromMailAddress, subjectInfo, bodyInfo, mailUsername, mailPassword, mailPort, false, false);
                email.AddAttachments(attachPath);
                email.Send();
            }
            catch (Exception ex)
            {
                Log.Error("LibUpdateNotice Thread_Send Exception:" + ex.Message);
            }
        }
 

using LibCSharpTool.Tool.Tool;
using System;
using System.Collections.Generic;
using System.IO;
using System.Net.Mail;
using System.Net.Mime;
using System.Text;

namespace LibUpdateNotice
{
    internal class CMail
    {
        private MailMessage mMailMessage;   //主要處理髮送郵件的內容（如：收發人地址、標題、主體、圖片等等）
        private SmtpClient mSmtpClient; //主要處理用smtp方式傳送此郵件的配置資訊（如：郵件伺服器、傳送埠號、驗證方式等等）
        private int mSenderPort;   //傳送郵件所用的埠號（htmp協議預設為25）
        private string mSenderServerHost;    //發件箱的郵件伺服器地址（IP形式或字串形式均可）
        private string mSenderPassword;    //發件箱的密碼
        private string mSenderUsername;   //發件箱的使用者名稱（即@符號前面的字串，例如：
 
[email protected]，使用者名稱為：hello）
        private bool mEnableSsl;    //是否對郵件內容進行socket層加密傳輸
        private bool mEnablePwdAuthentication;  //是否對發件人郵箱進行密碼驗證

        ///<summary>
        /// 建構函式
        ///</summary>
        ///<param name="server">發件箱的郵件伺服器地址</param>
        ///<param name="toMail">收件人地址（可以是多個收件人，程式中是以“;"進行區分的）</param>
        ///<param name="fromMail">發件人地址</param>
        ///<param name="subject">郵件標題</param>
        ///<param name="emailBody">郵件內容（可以以html格式進行設計）</param>
        ///<param name="username">發件箱的使用者名稱（即@符號前面的字串，例如：[email protected]，使用者名稱為：hello）</param>
        ///<param name="password">發件人郵箱密碼</param>
        ///<param name="port">傳送郵件所用的埠號（htmp協議預設為25）</param>
        ///<param name="sslEnable">true表示對郵件內容進行socket層加密傳輸，false表示不加密</param>
        ///<param name="pwdCheckEnable">true表示對發件人郵箱進行密碼驗證，false表示不對發件人郵箱進行密碼驗證</param>
        public CMail(string server, string toMail, string fromMail, string subject, string emailBody, string username, string password, string port, bool sslEnable, bool pwdCheckEnable)
        {
            try
            {
                mMailMessage = new MailMessage();
                mMailMessage.To.Add(toMail);
                mMailMessage.From = new MailAddress(fromMail);
                mMailMessage.Subject = subject;
                mMailMessage.Body = emailBody;
                mMailMessage.IsBodyHtml = false;
                mMailMessage.BodyEncoding = System.Text.Encoding.UTF8;
                mMailMessage.Priority = MailPriority.Normal;
                this.mSenderServerHost = server;
                this.mSenderUsername = username;
                this.mSenderPassword = password;
                this.mSenderPort = Convert.ToInt32(port);
                this.mEnableSsl = sslEnable;
                this.mEnablePwdAuthentication = pwdCheckEnable;
            }
            catch (Exception ex)
            {
                Log.Error("LibUpdateNotice CMail Exception:" + ex.Message);
            }
        }

        ///<summary>
        /// 新增附件
        ///</summary>
        ///<param name="attachmentsPath">附件的路徑集合，以分號分隔</param>
        public void AddAttachments(string attachmentsPath)
        {
            try
            {
                if (string.IsNullOrEmpty(attachmentsPath))
                {
                    return;
                }
                string[] path = attachmentsPath.Split(';'); //以什麼符號分隔可以自定義
                Attachment data;
                ContentDisposition disposition;
                for (int i = 0; i < path.Length; i++)
                {
                    data = new Attachment(path[i], MediaTypeNames.Application.Octet);
                    disposition = data.ContentDisposition;
                    disposition.CreationDate = File.GetCreationTime(path[i]);
                    disposition.ModificationDate = File.GetLastWriteTime(path[i]);
                    disposition.ReadDate = File.GetLastAccessTime(path[i]);
                    mMailMessage.Attachments.Add(data);
                }
            }
            catch (Exception ex)
            {
                Log.Error("LibUpdateNotice AddAttachments Exception:" + ex.Message);
            }
        }

        ///<summary>
        /// 郵件的傳送
        ///</summary>
        public void Send()
        {
            try
            {
                if (mMailMessage != null)
                {
                    mSmtpClient = new SmtpClient();
                    //mSmtpClient.Host = "smtp." + mMailMessage.From.Host;
                    mSmtpClient.Host = this.mSenderServerHost;
                    mSmtpClient.Port = this.mSenderPort;
                    mSmtpClient.UseDefaultCredentials = false;
                    mSmtpClient.EnableSsl = this.mEnableSsl;
                    if (this.mEnablePwdAuthentication)
                    {
                        System.Net.NetworkCredential nc = new System.Net.NetworkCredential(this.mSenderUsername, this.mSenderPassword);
                        //mSmtpClient.Credentials = new System.Net.NetworkCredential(this.mSenderUsername, this.mSenderPassword);
                        //NTLM: Secure Password Authentication in Microsoft Outlook Express
                        mSmtpClient.Credentials = nc.GetCredential(mSmtpClient.Host, mSmtpClient.Port, "NTLM");
                    }
                    else
                    {
                        mSmtpClient.Credentials = new System.Net.NetworkCredential(this.mSenderUsername, this.mSenderPassword);
                    }
                    mSmtpClient.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
                    mSmtpClient.Timeout = 20000;
                    mSmtpClient.Send(mMailMessage);
                }
            }
            catch (Exception ex)
            {
                Log.Error("LibUpdateNotice Send Exception:" + ex.Message);
            }
        }
    }
}