本文演示了在C#中使用邮件服务的一般方法：

//发送邮件
            MailMessage mail = new MailMessage();
            
            mail.Subject = subject;
            mail.From = new MailAddress(EmailFrom, EmailFromDip);
            mail.To.Add(new MailAddress(EmailTo, EmailToDsp)); //可以添加多个收件人       
            //mail.CC.Add(new MailAddress("xx@xxx.cn", "xys")); //抄送      
            mail.Body = EmailBody;
            mail.BodyEncoding = System.Text.Encoding.UTF8;
            mail.IsBodyHtml = false;
            mail.Priority = MailPriority.High;
            SmtpClient smtp = new SmtpClient(EmailSmtp, 25);
            smtp.EnableSsl = false;
            smtp.UseDefaultCredentials = false;
            smtp.Credentials = new System.Net.NetworkCredential(UserName, PassWord); //通行证    
            smtp.DeliveryMethod = SmtpDeliveryMethod.Network; //递送方法 为 网络   
            try
            {
                smtp.Send(mail);
                sw.WriteLine("EMail send success" + " " + DateTime.Now.ToLongDateString());
                sw.Flush();
            }
            catch (Exception ex)
            {
                sw.WriteLine("EMail send error" + " "+ DateTime.Now.ToLongDateString());
                sw.Flush();
            }