public class Email    {        #region 发送邮件        /// <summary>        /// 发送邮件        /// </summary>        /// <param name="sub">主题</param>        /// <param name="body">内容</param>        /// <param name="smtp">SMTP服务器</param>        /// <param name="userName">注册的邮箱如aa@163.com </param>        /// <param name="pwd">邮箱密码</param>        /// <param name="nicName">发送邮件时候使用的昵称</param>        /// <param name="sendUser">要发送的用户的邮箱</param>        /// <returns></returns>        public static int SendMail(string sub, string body, string smtp, string userName, string pwd, string nicName, string sendUser)        {            //邮件发送服务器            SmtpClient mySmtpClient = new SmtpClient(smtp); // host and port            //发送邮件的账号 密码            mySmtpClient.Credentials = new System.Net.NetworkCredential(userName, pwd);            //加密            //mySmtpClient.EnableSsl = true;            //新建邮件            MailMessage NewMsg = new MailMessage();            //发件人            NewMsg.From = new MailAddress(userName, nicName);            //收件人            NewMsg.To.Add(new MailAddress(sendUser));            //NewMsg.To.Add(new MailAddress("小小汪的邮箱"));            //邮件主题            NewMsg.Subject = sub;            //邮件的正文、编码方式            NewMsg.Body = body;            NewMsg.BodyEncoding = System.Text.Encoding.UTF8;            NewMsg.IsBodyHtml = true;            //附件            //NewMsg.Attachments.Add(new Attachment(CVPath));            //邮件的优先级            NewMsg.Priority = MailPriority.High;            //发送            try            {                mySmtpClient.Send(NewMsg);            }            catch (Exception ex)            {                throw new Exception(ex.Message);            }            return 0;        }        #endregion    }