發送郵件失敗-C＃-Godaddy

Question

我正在嘗試使用以下代碼發送電子郵件。 它托管在godaddy中。

MailMessage mail = new MailMessage("from@gmail.com", "to@gmail.com");
MailMessage mail = new MailMessage("from@gmail.com", "to@gmail.com");
SmtpClient client = new SmtpClient();
client.Port = 25;
client.DeliveryMethod = SmtpDeliveryMethod.Network;
client.UseDefaultCredentials = false;
client.Host = "smtp.gmail.com";
mail.Subject = "Test email";
string body;
using (var sr = new StreamReader(HttpContext.Current.Server.MapPath("~/App_Data/Template/") + "Email.html"))
{
    body = sr.ReadToEnd();
}
string messageBody = string.Format(body, name, expDate);
mail.Body = messageBody;
Attachment doc = new Attachment(HttpContext.Current.Server.MapPath("~/App_Data/class_3b.pdf"));
mail.Attachments.Add(doc);
client.Send(mail);

但是我遇到了錯誤：

{System.Net.Sockets.SocketException（0x80004005）：連接嘗試失敗，因為一段時間后連接方未正確響應，或者由於連接的主機未能在System.Net上響應74.125.130.109:25，連接建立失敗.Sockets.Socket.DoConnect（EndPoint endPointSnapshot，SocketAddress socketAddress）at System.Net.ServicePoint.ConnectSocketInternal（Boolean connectFailure，Socket s4，Socket s6，Socket＆socket，IPAddress＆address，ConnectSocketState狀態，IAsyncResult asyncResult，Exception＆exception）}

Answer 1

您需要驗證。 例如，請參閱通過C＃通過Google Apps帳戶發送電子郵件 。 Google甚至檢查驗證地址和“發件人”地址是否對應...

Answer 2

要使用System.Net.Mail發送郵件，您需要使用以下mailSettings:值在應用程序的web.config文件中配置SMTP服務mailSettings:

<system.net>
    <mailSettings>
      <smtp from="your email address">
        <network host="relay-hosting.secureserver.net" port="25" userName="your email address" password="******" defaultCredentials="true"/>
      </smtp>
    </mailSettings>
  </system.net>

背后的代碼：

MailMessage message = new MailMessage();
message.From = new MailAddress("your email address");

message.To.Add(new MailAddress("your recipient"));

message.Subject = "your subject";
message.Body = "content of your email";

SmtpClient client = new SmtpClient();
client.Send(message);