发送邮件

private static string emailAccount = WebConfigurationManager.AppSettings["emailAccount"];
        private static string emailPwd = WebConfigurationManager.AppSettings["emailPwd"];
        private static string emailCode = WebConfigurationManager.AppSettings["emailCode"];
        private static string emailPOP3 = WebConfigurationManager.AppSettings["emailPOP3"];
        private static string emailSMTP = WebConfigurationManager.AppSettings["emailSMTP"];
        private static string emailIMAP = WebConfigurationManager.AppSettings["emailIMAP"];

1 普通发送邮件

public static void SendMailByEmail(string[] file,string subject = "", string body = "", List<string> receivers = null)
        {
            MailMessage message = new MailMessage();
            MailAddress fromAddr = new MailAddress(emailAccount);
            message.From = fromAddr;
            foreach (var item in receivers)
            {
                message.To.Add(item);
            }
            foreach (var item in file)
            {
                if (string.IsNullOrEmpty(item))
                    continue;
                message.Attachments.Add(new Attachment(item));
            }
            message.Subject = subject;
            message.SubjectEncoding = Encoding.UTF8;
            message.Body = body;
            //允许html标签
            message.IsBodyHtml = true;
            message.BodyEncoding = Encoding.UTF8;  
            SmtpClient client = new SmtpClient(emailSMTP, 25);
            client.UseDefaultCredentials = true;
            client.Credentials = new NetworkCredential(emailAccount, emailCode);
            client.EnableSsl = true;

            //避免远程证书无效
            ServicePointManager.ServerCertificateValidationCallback =
delegate(Object obj, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) { return true; };

            client.Send(message);
        }

2 使用默认邮件发送

public static void SendEmail_Process(string subject = "", string body = "", string receivers = "")
        {
            //Process.Start(new ProcessStartInfo("mailto:user@126.com?subject=test&body=Dear:%0A%0DThis is a test mail."));
            string email = string.Format("mailto:{0}?subject={1}&body={2}"
                , receivers
                , subject
                , body);
            Process.Start(new ProcessStartInfo(email));
        }