发送邮件失败-C＃-Godaddy

Question

我正在尝试使用以下代码发送电子邮件。 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);

但是我遇到了错误：

{System.Net.Sockets.SocketException（0x80004005）：连接尝试失败，因为一段时间后连接方未正确响应，或者由于连接的主机未能在System.Net上响应74.125.130.109:25，连接建立失败.Sockets.Socket.DoConnect（EndPoint endPointSnapshot，SocketAddress socketAddress）at System.Net.ServicePoint.ConnectSocketInternal（Boolean connectFailure，Socket s4，Socket s6，Socket＆socket，IPAddress＆address，ConnectSocketState状态，IAsyncResult asyncResult，Exception＆exception）}

Answer 1

您需要验证。 例如，请参阅通过C＃通过Google Apps帐户发送电子邮件 。 Google甚至检查验证地址和“发件人”地址是否对应...

Answer 2

要使用System.Net.Mail发送邮件，您需要使用以下mailSettings:值在应用程序的web.config文件中配置SMTP服务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>

背后的代码：

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);