Question

可能重复：
GMail SMTP via C# .Net errors on all ports

当我尝试在C＃程序中发送电子邮件时出现以下错误。我在Windows 7上使用Visual Studio 2008.我会首先粘贴我的代码，然后是错误：

class email_log_files
    {

          private string login_username = "my_gmail_id";
          private string login_password = "my_gmail_password";

          public void send_email()
          {
              string src_address = "my_gmail_id@gmail.com";
              string dest_address = "my_destination_id@xyz.edu";


              try
              {
                  MailMessage email_msg = new MailMessage();

                  SmtpClient email_client = new SmtpClient();
                  email_msg.From = new MailAddress(src_address);
                  email_msg.Sender = new MailAddress(src_address);
                  email_msg.ReplyTo = new MailAddress(src_address);
                  email_msg.To.Add(dest_address);
                  email_msg.Subject = "Test";
                  email_msg.Body = "Body of the message";
                  NetworkCredential credentials = new NetworkCredential(login_username, login_password);


                  email_client.Credentials = credentials;
                  email_client.Host = "smtp.gmail.com";
                  email_client.Port = 465;
                  email_client.EnableSsl = true;


                  email_client.Send(email_msg);
                  Console.WriteLine("Message Sent Successfully!!");
                  Console.ReadLine();

            }

        }
    }

错误信息如下：

The operation has timed out.

为什么总是超时？我确信我有正确的smtp服务器地址和gmail的端口号，因为我已配置相同的Outlook。任何帮助或想法？

将端口更改为587后，错误如下。我刚刚禁用我的防火墙，看看是不是问题而且不是。新错误（对于端口587）：

当我将端口更改为587时，对我来说是错误：

Failure sending mail.

System.Net.WebException: Unable to connect to the remote server ---> System.Net.
Sockets.SocketException: No connection could be made because the target machine
actively refused it 74.125.113.109:587

   at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddre
ss socketAddress)

   at System.Net.Sockets.Socket.InternalConnect(EndPoint remoteEP)

   at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Sock
et s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state,
IAsyncResult asyncResult, Int32 timeout, Exception& exception)
   --- End of inner exception stack trace ---

   at System.Net.ServicePoint.GetConnection(PooledStream PooledStream, Object ow
ner, Boolean async, IPAddress& address, Socket& abortSocket, Socket& abortSocket
6, Int32 timeout)

   at System.Net.PooledStream.Activate(Object owningObject, Boolean async, Int32
 timeout, GeneralAsyncDelegate asyncCallback)

   at System.Net.PooledStream.Activate(Object owningObject, GeneralAsyncDelegate
 asyncCallback)

   at System.Net.ConnectionPool.GetConnection(Object owningObject, GeneralAsyncD
elegate asyncCallback, Int32 creationTimeout)

   at System.Net.Mail.SmtpConnection.GetConnection(String host, Int32 port)

   at System.Net.Mail.SmtpTransport.GetConnection(String host, Int32 port)

   at System.Net.Mail.SmtpClient.GetConnection()

   at System.Net.Mail.SmtpClient.Send(MailMessage message)
System

System.Collections.ListDictionaryInternal

谢谢， VP

Answer 1

它是您的端口...... Gmail需要端口587。

如果这不起作用，我可以给你我的电子邮件类。

修改

private static void SendEmailMessageGmail(System.Net.Mail.MailMessage message) { message.IsBodyHtml = true; message.BodyEncoding = Encoding.UTF8; System.Net.NetworkCredential cred = new System.Net.NetworkCredential(EmailUsername, EmailPassword); SmtpClient smtp = new SmtpClient("smtp.gmail.com"); smtp.UseDefaultCredentials = false; smtp.EnableSsl = true; smtp.Credentials = cred; smtp.Port = 587; smtp.Send(message); }

编辑：将此添加到您的代码中：email_client.UseDefaultCredentials = false;

Answer 2

由于您正在引用System.Web，我认为这是一个Web应用程序，尽管我从您的描述中并不十分清楚。如果这实际上是一个Web应用程序，请确保您的web.config文件具有以下条目：

  <system.net>
    <mailSettings>
      <smtp>
        <network host="smtp.gmail.com" port="465" userName="<UID>" password="<PW>"/>
      </smtp>
    </mailSettings>
  </system.net>

这可以防止您必须在email_log_files类

中指定此信息

Answer 3

不确定这是否有用，但您是否检查过您的IP没有阻止从您的IP发送电子邮件？我曾经遇到过类似的问题，我整个周末都没有把头发拉出来。

所以，为了消除这一点，值得进行检查。祝你好运。

Answer 4

可能是防火墙或其他东西。我发现尝试它的最佳方法是手动连接到服务器。

只需打开命令提示符并写入：
telnet your.mail.server 25

这通常会给你一个类似于“220 your.mail.server ESMTP”的回复。

如果你使用Vista或Win7，你可能必须先启用内置的Telnet客户端（转到“程序和功能”并选择“打开或关闭Windows功能”，然后选择Telnet客户端）

Answer 5

尝试将完整的电子邮件地址放入NetworkCredential用户名

通过.NET中的GMail发送电子邮件

5 个答案: