通过smtp直接发送邮件

/// <summary>
    ///Smtp 的摘要说明
    /// </summary>
    public class Smtp
    {
        public Smtp()
        {
            //
            //TODO: 在此处添加构造函数逻辑
            //
        }

        /// <summary>
        /// 通过smtp直接发送邮件
        /// </summary>
        /// <param name="toEmail">收件箱地址</param>
        /// <param name="toDisplayName">显示收件人名称</param>
        /// <param name="subject"></param>
        /// <param name="body"></param>
        /// <returns></returns>
        public static bool SenMailBySMTP(string toEmail,string toDisplayName,string toCc,string toBcc, string subject, string body)
        {
            //string toEmail, string toCCMail, string toBCCMail, string strToName, string strFromName, string strContent, string strTitle, string strContentType, string strFiles

            string fromEmail = ConfigurationManager.AppSettings["mailusername"].ToString();//发件箱地址
            string fromDisplayName = ConfigurationManager.AppSettings["FromName"].ToString();//显示的发件人名称
            string pwd = ConfigurationManager.AppSettings["mailpassword"].ToString();//发件箱密码
            string smtpAddress = ConfigurationManager.AppSettings["mailSmtpHost"].ToString();//smtp host
         

            //邮件
            MailMessage mail = new MailMessage();

            //发件人地址
            mail.From = new MailAddress(fromEmail, fromDisplayName);

            //收件人地址
            if (toEmail.Length > 0)
                mail.To.Add(toEmail);
            else return false;

            //抄送人
            if(toCc.Length>0)
            mail.CC.Add(toCc);

            //密送
            if(toBcc.Length>0)
            mail.Bcc.Add(toBcc);

            //mail.s
            mail.SubjectEncoding = Encoding.UTF8;
            mail.Subject = subject;
            mail.IsBodyHtml = true; //是否允许内容为 HTML 格式
            mail.BodyEncoding = Encoding.UTF8;
            mail.Body = body;
            //mail.Attachments.Add(new Attachment("E:\\99.jpg")); //添加一个附件

            SmtpClient smtp = new SmtpClient(smtpAddress);
            smtp.Credentials = new NetworkCredential(fromEmail, pwd); //SMTP 验证
          
            bool rr = true;

            try
            {
                smtp.Send(mail);
            }
            catch
            {
                rr = false;
            }

            mail.Attachments.Dispose(); //邮件发送完毕，释放对附件的锁定

            return rr;

        }
    }