C# 邮件群发源码实现

        /// <summary>
        /// 群发邮件
        /// </summary>
        /// <param name="title">邮件标题</param>
        /// <param name="content">邮件内容</param>
        /// <param name="ToEmail">邮件地址数组</param>
        /// <param name="ssl">是否加密发送</param>
        /// <returns></returns>
        public static string SendMail(string title, string content, string[] ToEmail, bool ssl)
        {
            string errormess = "true";

            string smtp = ConfigurationManager.AppSettings["Smtp"];           //如@"smtp.163.com";
            int post = int.Parse(ConfigurationManager.AppSettings["Port"]);   //如25; 
            string address = ConfigurationManager.AppSettings["Address"];     //如xxxx@163.com
            string username = ConfigurationManager.AppSettings["Username"];   //如xxxx@163.com
            string password = ConfigurationManager.AppSettings["Password"];   //如********

            try
            {
                MailMessage mail = new MailMessage();
                SmtpClient SmtpServer = new SmtpClient(smtp);

                mail.From = new MailAddress(address);

                foreach (string val in ToEmail)
                    mail.To.Add(val);

                mail.IsBodyHtml = true;
                mail.Subject = title;