smtp.SendMail(msg);

            return true;
        }   
   
        public override void Close()
        {
            msg = null;
            smtp = null;
        }

        private static string GetOpenSmtpPriority( System.Web.Mail.MailPriority priority)
        {
            // 邮件等级，1为加急，3为普通，5为低级

            if (priority == System.Web.Mail.MailPriority.High)
                return OpenSmtp.Mail.MailPriority.High;

            if (priority == System.Web.Mail.MailPriority.Low)
                return OpenSmtp.Mail.MailPriority.Low;

            return OpenSmtp.Mail.MailPriority.Normal;
        }

        #endregion
    }
}

实现方案三：

（上面两种实现方案已经足够满足目前的需求，有必要的话再继续扩展）

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