从 Windows 应用程序使用 amazon ses 发送电子邮件时对 SSPI 的调用失败

Question

我正在使用 amazon ses 发送电子邮件，并且在网站和 Windows 应用程序中使用相同的配置。
该网站正常发送电子邮件，但 Windows 应用程序给我这个错误，而不是发送电子邮件：

请注意，当我将Windows应用程序中的smtp配置更改为gmail之类的东西时，它工作正常，问题仅发生在亚马逊ses上，并且就在今天开始发生，之前ses在Windows应用程序上运行良好。
另请注意，网站和 Windows 应用程序现在都可以在本地运行。

堆栈跟踪：

   at System.Net.Security.SslState.StartSendAuthResetSignal(ProtocolToken message, AsyncProtocolRequest asyncRequest, Exception exception)
   at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
   at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)
   at System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer, Int32 count, AsyncProtocolRequest asyncRequest)
   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.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
   at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)
   at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
   at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
   at System.Net.TlsStream.CallProcessAuthentication(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   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 offset, Int32 size)
   at System.Net.PooledStream.Write(Byte[] buffer, Int32 offset, Int32 size)
   at System.Net.Mail.SmtpConnection.Flush()
   at System.Net.Mail.ReadLinesCommand.Send(SmtpConnection conn)
   at System.Net.Mail.EHelloCommand.Send(SmtpConnection conn, String domain)
   at System.Net.Mail.SmtpConnection.GetConnection(ServicePoint servicePoint)
   at System.Net.Mail.SmtpTransport.GetConnection(ServicePoint servicePoint)
   at System.Net.Mail.SmtpClient.GetConnection()
   at System.Net.Mail.SmtpClient.Send(MailMessage message)
   at Mail.EmailSender.SendMail(MailMessage mail) in e:\Mail\EmailSender.cs:line 175

内部异常：

{"The message received was unexpected or badly formatted"}

Answer 1

我遇到了同样的问题，最终归结为尝试连接时有效的 SecurityProtocol。

添加

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

在 client.Send 为我解决之前（我们在其他地方将其更改为 Ssl3 以与不同的服务通信） 如果 .Net 团队中的任何人正在阅读，如果此（和 ServerCertificateValidationCallback）不是全局的，那就太好了。

我不知道这是 SES 的“功能”还是我只是假设魔法应该起作用，但您可以在这里看到一些历史记录： https://forums.aws.amazon.com/thread.jspa ?messageID=472516