我设立了亚马逊SES,最初工作了几个小时,然后突然停了.我发送的所有电子邮件和我们的域名已经过验证.我们不发送批量电子邮件 – 每天只有几百个.每当我更改web.config,它似乎允许它再工作2-3个小时.例如,它停止工作,所以我将端口587切换到25,并开始工作2-3个小时,然后停止.然后我转回到587,同样的事情发生了.一旦停止工作,它似乎不会再次重新开始.它运行在两个负载平衡的服务器上,asp.net框架v2.0,IIS 7.5.这是我使用的代码：

web.config中：@H_502_3@

<system.net>
  <mailSettings>
    <smtp deliveryMethod="Network" from="no-reply@ourdomain.com">
      <network defaultCredentials="false" host="email-smtp.us-east-1.amazonaws.com" userName="***" password="***" port="587" />
    </smtp>
  </mailSettings>
</system.net>

c#代码：@H_502_3@

var smtpClient = new SmtpClient() { EnableSsl = true };

var mailMessage =
    new MailMessage(fromAddress,toAddress,subject,body)
    {
        IsBodyHtml = true
    };

smtpClient.Send(mailMessage);

以下是我收到的两个错误：@H_502_3@

The following exception was thrown by the web event provider '(null)' in the application '/' (in an application lifetime a maximum of one exception will be logged per provider instance):

System.Web.HttpException: Unable to send out an e-mail to the SMTP server. Please ensure that the server specified in the <smtpMail> section is valid. ---> System.Net.Mail.SmtpException: Failure sending mail. ---> System.IO.IOException: Received an unexpected EOF or 0 bytes from the transport stream.
   at System.Net.FixedSizeReader.ReadPacket(Byte[] buffer,Int32 offset,Int32 count)
   at System.Net.Security.SslState.StartReadFrame(Byte[] buffer,Int32 readBytes,AsyncProtocolRequest asyncRequest)
   at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer,AsyncProtocolRequest asyncRequest)
   at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst,Byte[] buffer,AsyncProtocolRequest asyncRequest)
   at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
   at System.Threading.ExecutionContext.runTryCode(Object userData)
   at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code,CleanupCode backoutCode,Object userData)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext,ContextCallback callback,Object state)
   at System.Net.TlsStream.ProcessAuthentication(LazyAsyncResult result)
   at System.Net.TlsStream.Write(Byte[] buffer,Int32 size)
   at System.Net.PooledStream.Write(Byte[] buffer,Int32 size)
   at System.Net.Mail.SmtpConnection.Flush()
   at System.Net.Mail.ReadLinesCommand.Send(SmtpConnection conn)
   at System.Net.Mail.SmtpConnection.GetConnection(String host,Int32 port)
   at System.Net.Mail.SmtpClient.Send(MailMessage message)
   --- End of inner exception stack trace ---
   at System.Net.Mail.SmtpClient.Send(MailMessage message)
   at System.Web.Management.MailWebEventProvider.SendMail(MailMessage msg)
   --- End of inner exception stack trace ---
   at System.Web.Management.MailWebEventProvider.SendMail(MailMessage msg)
   at System.Web.Management.SimpleMailWebEventProvider.SendMessageInternal(WebBaseEventCollection events,Int32 notificationSequence,Int32 begin,DateTime lastFlush,Int32 discardedSinceLastFlush,Int32 eventsInBuffer,Int32 messageSequence,Int32 messagesInNotification,Int32 eventsInNotification,Int32 eventsLostDueToMessageLimit)
   at System.Web.Management.SimpleMailWebEventProvider.SendMessage(WebBaseEvent eventRaised)
   at *****.Global.SimpleMailWithSslWebEventProvider.ProcessEvent(WebBaseEvent raisedEvent)
   at System.Web.Management.WebBaseEvent.RaiseInternal(WebBaseEvent eventRaised,ArrayList firingRuleInfos,Int32 index0,Int32 index1)

The following exception was thrown by the web event provider '(null)' in the application '/' (in an application lifetime a maximum of one exception will be logged per provider instance):

System.Web.HttpException: Unable to send out an e-mail to the SMTP server. Please ensure that the server specified in the <smtpMail> section is valid. ---> System.Net.Mail.SmtpException: Service not available,closing transmission channel. The server response was: Timeout waiting for data from client.
   at System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode,String response)
   at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender,MailAddressCollection recipients,String deliveryNotify,SmtpFailedRecipientException& exception)
   at System.Net.Mail.SmtpClient.Send(MailMessage message)
   at System.Web.Management.MailWebEventProvider.SendMail(MailMessage msg)
   --- End of inner exception stack trace ---
   at System.Web.Management.MailWebEventProvider.SendMail(MailMessage msg)
   at System.Web.Management.SimpleMailWebEventProvider.SendMessageInternal(WebBaseEventCollection events,Int32 index1)

我试图在亚马逊论坛上获得帮助,但没有任何运气.似乎有些东西干扰了连接,但我不知道什么.有任何想法吗？谢谢.@H_502_3@

String username = "SMTP-USERNAME";  // Replace with your SMTP username.
  String password = "SMTP-PASSWORD";  // Replace with your SMTP password.
  String host = "email-smtp.us-east-1.amazonaws.com";
  int port = 25;

  using (var client = new System.Net.Mail.SmtpClient(host,port))
  {
    client.Credentials = new System.Net.NetworkCredential(username,password);
    client.EnableSsl = true;

    client.Send
    (
              "FROM@EXAMPLE.COM",// Replace with the sender address.
              "TO@EXAMPLE.COM",// Replace with the recipient address.
              "Testing Amazon SES through SMTP","This email was delivered through Amazon SES via the SMTP end point."
    );
  }