gmail对话通过smtp

如何通过smtp发送电子邮件作为gmail会话的一部分?选修同样的科目是行不通的……

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        MailMessage mail = new MailMessage();
        SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
        mail.From = new MailAddress("@googlemail.com");
        mail.To.Add("@.com");
        mail.Subject = "(Somee.com notification) New order confirmation";
        mail.Body = "(Somee.com notification) New order confirmation";
        SmtpServer.Port = 587;
        SmtpServer.Credentials = new System.Net.NetworkCredential("", "");
        SmtpServer.EnableSsl = true;
        SmtpServer.Send(mail);

mail.Headers.Add("In-Reply-To", <messageid>);