C# 用QQ企業郵箱發郵件

問題System.Net.Mail下的SmtpClient來發送郵件，而System.Net.Mail only僅支持Explicit SSL

不要465端口,用25，不用EnableSsl = true；

 

    {
        static void Main(string[] args)
        {
            SmtpClient client = new SmtpClient();
            client.Host = "smtp.exmail.qq.com";
            client.Port = 25;
           // client.Port = 465;
          //  client.EnableSsl = true;
            client.Timeout = 10000;
            client.DeliveryMethod = SmtpDeliveryMethod.Network;
            client.UseDefaultCredentials = false;
            client.Credentials = new System.Net.NetworkCredential("[e-mail]", "1234567890");
            MailMessage mm = new MailMessage("[e-mail]", "[e-mail]", "test", "test");
            mm.BodyEncoding = UTF8Encoding.UTF8;
            mm.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
            client.Send(mm);
        }
    }

 

最后在配置TFS郵件通知設置的時候端口改用25，不選擇SSL，順利解決問題。

SmtpClient發送郵件超時的異常參考：

http://blogs.msdn.com/b/webdav_101/archive/2008/06/02/system-net-mail-with-ssl-to-authenticate-against-port-465.aspx