使用SMTP发送邮件

　　　　　/// <summary>
        /// 发送邮件
        /// </summary>
        /// <param name="MailServerName">服务器</param>
        /// <param name="PubMail">公共邮箱地址</param>
        /// <param name="MailUserName">用户名</param>
        /// <param name="MailPassword">密码</param>
        /// <param name="To">收件人</param>
        /// <param name="CC">抄送人</param>
        /// <param name="MailHistoryGUID">邮件记录guid，获取附件</param>
        /// <param name="MailBody">邮件正文</param>
        /// <param name="Subject">主题</param>
        /// <returns></returns>
        private int SendMessage_internal(string MailServerName, string PubMail, string MailUserName, string MailPassword, string To, string CC, string MailHistoryGUID, string MailBody, string Subject)
        {
            //简单邮件传输协议类
            SmtpClient client = new SmtpClient();
            //电子邮件信息类
            MailMessage mailMessage = new MailMessage();
            int isSucess = 0;
            try
            {
                client.Host = MailServerName;//设置邮件服务器
                client.Port = 25;//smtp主机端口号，默认25
                client.DeliveryMethod = SmtpDeliveryMethod.Network;
                client.Credentials = new System.Net.NetworkCredential(PubMail, MailPassword);

                mailMessage.Sender = new MailAddress(PubMail, MailUserName);//发件人信息
                //设置发件人
                mailMessage.From = new MailAddress(PubMail, MailUserName);

                //设置收件
                DataTable dtTemp = GetMailToList();
                int count = dtTemp.Rows.Count;
                if (count > 0)
                {
                    for (int i = 0; i < count; i++)
                    {
                        mailMessage.To.Add(new MailAddress(dtTemp.Rows[i]["Email"].ToString(), dtTemp.Rows[i]["UserName"].ToString()));
                    }
                }
                //设置抄送人
                if (!string.IsNullOrEmpty(CC))
                {
                    dtTemp = GetCCUserList();
                    count = dtTemp.Rows.Count;
                    if (count > 0)
                    {
                        for (int i = 0; i < count; i++)
                        {
                            mailMessage.CC.Add(new MailAddress(dtTemp.Rows[i]["Email"].ToString(), dtTemp.Rows[i]["UserName"].ToString()));
                        }
                    }
                }
                //添加附件
                dtTemp = GetAttachDocuments();
                count = dtTemp.Rows.Count;
                if (count > 0)
                {
                    for (int i = 0; i < count; i++)
                    {
                        mailMessage.Attachments.Add(new Attachment(HttpContext.Current.Server.MapPath("/") + dtTemp.Rows[i]["location"] + dtTemp.Rows[i]["FileName"].ToString()));
                    }
                }
                //主题
                mailMessage.Subject = Subject;
                mailMessage.Body = MailBody;
                mailMessage.SubjectEncoding = System.Text.Encoding.UTF8;//邮件主题编码
                mailMessage.BodyEncoding = System.Text.Encoding.GetEncoding("GB2312");//邮件内容编码
                mailMessage.IsBodyHtml = true;//邮件内容是否为html格式
                client.Send(mailMessage);
                isSucess = 1;
            }
            catch (Exception e)
            {
                MyDB.LogException(e);
                isSucess = 0;
            }
            finally
            {
                mailMessage.Dispose();
            }
            return isSucess;
        }

    }