c# - 在Windows应用程序中使用Amazon ses发送电子邮件时，对SSPI的调用失败

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应用程序给我此错误，而不是发送电子邮件：

请注意，当我将Windows应用程序中的smtp配置更改为类似gmail的东西时，它可以正常工作，该问题仅发生在亚马逊ses上，并且直到今天ses才在Windows应用程序上正常运行时才开始发生。
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

InnerException：

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

最佳答案

我遇到了同样的问题，最后归结为尝试连接时生效的SecurityProtocol。

新增中

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls;

在为我解决该问题之前（Send为我解决了该问题（我们将其更改为Ssl3，以便与其他服务进行通信））如果.Net团队中的任何人正在阅读，那么（如果不是）（和ServerCertificateValidationCallback）不是全局的，那就太好了。

我不知道这是否是SES的“功能”，或者我只是假设魔术应该起作用，但是您可以在此处看到一些历史记录：
https://forums.aws.amazon.com/thread.jspa?messageID=472516