【C#】Mail帮助类

public class EmailHelper
    {

        public static string SendWithSenderEmail(string OurEmail, string OurPs, string subject, string body, string attachment, string attachmentf, string attachments, string[] Mail_Image, string toes, string cc = null,string bcc=null)
        {
            try
            {
                string SYS_TEST_EMAIL_OffON = ConfigHelper.GetConfigString("SYS_TEST_EMAIL_OffON");
                string SYS_IS_TESTEVN = ConfigHelper.GetConfigString("SYS_Is_TestEvn");
                string TestEmailsWhite = ConfigHelper.GetConfigString("TestEmailsWhite");
                string WebSite = ConfigHelper.GetConfigString("SMTP");
                MailMessage message = new MailMessage();
                SmtpClient client = new SmtpClient(WebSite, 25); //smtp address and port
                string SYS_EMAIL = ConfigHelper.GetConfigString("SYS_EMAIL");
                message.From = new MailAddress(OurEmail);//the email address used to send email

                string[] whiteEmailList = TestEmailsWhite.Split(‘;‘);

                if (!string.IsNullOrEmpty(toes))
                {
                    string[] toList = toes.Split(‘;‘);

                    ArrayList arrTo = new ArrayList();
                    foreach (string str in toList)
                    {
                        //过滤重复邮箱
                        if (!string.IsNullOrEmpty(str) && !arrTo.Contains(str.Trim()))
                        {
                            if (SYS_TEST_EMAIL_OffON == "ON")
                            {
                                // 如果测试开关开启, 仅在白名单中的邮件允许发送
                                foreach (var email in whiteEmailList)
                                {
                                    if (email.Trim() == str.Trim())
                                    {
                                        arrTo.Add(str.Trim());
                                        message.To.Add(new MailAddress(str.Trim()));
                                    }
                                }
                            }
                            else
                            {
                                arrTo.Add(str.Trim());
                                message.To.Add(new MailAddress(str.Trim()));
                            }
                        }
                    }
                }
                else
                {
                    return "发邮件发件人不许为空:"
                                 + "发件人：" + OurEmail + " \n\t"
                                 + "SMTP身份验证用户名" + OurEmail.Split(‘@‘)[0];
                }


                if (!string.IsNullOrEmpty(cc))
                {
                    string[] ccList = cc.Split(‘;‘);

                    ArrayList arrCC = new ArrayList();
                    foreach (string str in ccList)
                    {
                        //过滤重复邮箱
                        if (!string.IsNullOrEmpty(str) && !arrCC.Contains(str.Trim()))
                        {
                            if (SYS_TEST_EMAIL_OffON == "ON")
                            {
                                // 如果测试开关开启, 仅在白名单中的邮件允许发送
                                foreach (var email in whiteEmailList)
                                {
                                    if (email.Trim() == str.Trim())
                                    {
                                        arrCC.Add(str.Trim());
                                        message.CC.Add(new MailAddress(str.Trim()));
                                    }
                                }
                            }
                            else
                            {
                                arrCC.Add(str.Trim());
                                message.CC.Add(new MailAddress(str.Trim()));
                            }
                        }
                    }
                }
                //密送
                if (!string.IsNullOrEmpty(bcc))
                {
                    string[] bccList = bcc.Split(‘;‘);

                    ArrayList arrBCC = new ArrayList();
                    foreach (string str in bccList)
                    {
                        //过滤重复邮箱
                        if (!string.IsNullOrEmpty(str) && !arrBCC.Contains(str.Trim()))
                        {
                            if (SYS_TEST_EMAIL_OffON == "ON")
                            {
                                // 如果测试开关开启, 仅在白名单中的邮件允许发送
                                foreach (var email in whiteEmailList)
                                {
                                    if (email.Trim() == str.Trim())
                                    {
                                        arrBCC.Add(str.Trim());
                                        message.Bcc.Add(new MailAddress(str.Trim()));
                                    }
                                }
                            }
                            else
                            {
                                arrBCC.Add(str.Trim());
                                message.Bcc.Add(new MailAddress(str.Trim()));
                            }
                        }
                    }
                }
                message.CC.Add(new MailAddress(SYS_EMAIL));
                message.Bcc.Add(new MailAddress(SYS_EMAIL));
                if (SYS_IS_TESTEVN == "ON")
                {
                    message.Subject = "测试环境-" + subject;
                }
                else
                {
                    message.Subject = subject;
                }
                message.Body = body;
                message.IsBodyHtml = true;
                message.Priority = MailPriority.Normal;
                if (!string.IsNullOrEmpty(attachment))
                {
                    message.Attachments.Add(new Attachment(attachment));
                }
                if (!string.IsNullOrEmpty(attachmentf))
                {
                    message.Attachments.Add(new Attachment(attachmentf));
                }
                if (!string.IsNullOrEmpty(attachments))
                {
                    message.Attachments.Add(new Attachment(attachments));
                }
                if (Mail_Image != null && Mail_Image.Length > 0)
                {
                    for (int i = 0; i < Mail_Image.Length; i++)
                    {
                        if (!string.IsNullOrEmpty(Mail_Image[i]))
                        {
                            System.Net.Mail.Attachment Imageattachment = new System.Net.Mail.Attachment(Mail_Image[i]);
                            message.Attachments.Add(Imageattachment);
                            message.Body = message.Body.Replace("<$template_IMG" + (i + 1) + ">", "<img src=\"cid:" + Imageattachment.ContentId + "\"/>");
                        }
                        else
                        {
                            message.Body = message.Body.Replace("<$template_IMG" + (i + 1) + ">", "");
                        }
                    }
                }
                #region If the smtp doesn‘t require ssl, the code could removed.
                string userOfAD = OurEmail.Split(‘@‘)[0];
                NetworkCredential c = new NetworkCredential { Password = OurPs, UserName = userOfAD };
                client.Credentials = c;
                //client.EnableSsl = true;
                #endregion

                StringBuilder builder = new StringBuilder();
                builder.AppendFormat("发邮件给 {0}, 标题：{1} , 当前时间：{2}", message.To.ToString(), message.Subject, DateTime.Now);

                client.Send(message);

                builder.Clear();
                builder.AppendFormat("邮件发送成功！标题：{0}， 时间：{1}", message.Subject, DateTime.Now);
            }
            catch (Exception ex)
            {
                string strE = "发邮件内部错误:" + ex.InnerException + " \n\t"
                                  + "堆栈:" + ex.StackTrace + " \n\t"
                                  + "出错信息:" + ex.Message + " \n\t"
                                  + "错误源:" + ex.Source + " \n\t"
                                  + "发件人：" + OurEmail + " \n\t"
                                  + "SMTP身份验证用户名" + OurEmail.Split(‘@‘)[0];
                //Log(文本)
                MyLogHelper.Info(System.Reflection.MethodBase.GetCurrentMethod().ToString() + strE.ToString());


                return strE;
            }
            return null;
        }

        /// <summary>
        /// 用系统中 config 里面配置的邮箱  异步 发送邮件
        /// </summary>
        /// <param name="Email"></param>
        /// <param name="email_Body"></param>
        /// <param name="Object"></param>
        /// <returns></returns>
        public static string Sys_SentEmail(string Email, string email_Body, string Object)
        {

            //发送邮件。
            string SYS_EMAIL = ConfigHelper.GetConfigString("SYS_EMAIL");
            string SYS_EMAILPASSWORD = ConfigHelper.GetConfigString("SYS_EMAILPASSWORD");
            string SYS_SMTP = ConfigHelper.GetConfigString("SMTP");
            //<!--如果打开测试邮箱开关，则所有发送的邮件都发给下面的系统邮箱-->
            //string SYS_TEST_EMAIL_OffON = ConfigHelper.GetConfigString("SYS_TEST_EMAIL_OffON");
            //if (SYS_TEST_EMAIL_OffON == "ON")
            //{
            //    Email = SYS_EMAIL;
            //}
            string SyncDataErrorEmail = ConfigHelper.GetConfigString("Email_ForSyncError");

            if (Email == "SyncDataError")
            {
                if (SyncDataErrorEmail == null || string.IsNullOrEmpty(SyncDataErrorEmail))
                {
                    SyncDataErrorEmail = "mingweil@sweetome.com";
                }
            }
            string error = null;

            System.Threading.Thread t = new System.Threading.Thread(() =>
            {
                error = EmailHelper.SendWithSenderEmail(SYS_EMAIL, SYS_EMAILPASSWORD, Object, email_Body, "", "", "", null, SyncDataErrorEmail, null);
            });
            t.IsBackground = true;
            t.Start();

            return error;
        }

        public static string User_SentEmail(string toEmail, string ccEmail,string bccEmail, string email_Body, string Object)
        {
            //发送邮件。
            string SYS_EMAIL = ConfigHelper.GetConfigString("SYS_EMAIL");
            string SYS_EMAILPASSWORD = ConfigHelper.GetConfigString("SYS_EMAILPASSWORD");
            string SYS_SMTP = ConfigHelper.GetConfigString("SMTP");

            string error = null;

            error = EmailHelper.SendWithSenderEmail(SYS_EMAIL, SYS_EMAILPASSWORD, Object, email_Body, "", "", "", null, toEmail, ccEmail,bccEmail);

            return error;
        }
    }