Question

以下代码在通过gmail的smtp发送时有效，但不能通过交换机2K7发送。在同一台机器上我有outlook express，它通过交换成功发送。我在代码中使用与outlook express中相同的配置，但不断收到错误：

The SMTP server requires a secure connection or the client was not authenticated.
The server response was: 5.7.1 Client was not authenticated.
Stack:    at System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode, String response)
   at System.Net.Mail.MailCommand.Send ...

Ssl设置为true。

这里是代码：

//create new MailMessage
mailmessage = new MailMessage(definition.From, definition.To);
mailmessage.ReplyToList.Add(definition.From);
mailmessage.IsBodyHtml = true;
mailmessage.SubjectEncoding = System.Text.Encoding.UTF8;
mailmessage.BodyEncoding = System.Text.Encoding.UTF8;
mailmessage.Subject = definition.Subject;
mailmessage.Body = definition.Body;

mailmessage = MessageBody.CompleteMessage(mailmessage, definition);

//send MailMessage
//get smtpclient
SmtpClient smtp = null;

if (smtp == null)
{
//create, init
smtp = new SmtpClient(definition.Server, definition.Port)
{
    Credentials = new NetworkCredential(definition.Uid, definition.Pwd),
    EnableSsl = definition.Ssl,
    DeliveryMethod = SmtpDeliveryMethod.Network
};

}
ServicePointManager.ServerCertificateValidationCallback = delegate(object s, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) { return true; };
smtp.Send(mailmessage);

更新：当我取出回调线并尝试发送时，我收到此错误：

Exception: The remote certificate is invalid according to the validation procedure.. Stack:    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.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.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.runTryCode(Object userData)
   at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
   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)

Answer 1

找到了一个很好的解决方案。不要尝试使用smtp与交换2K7及以上。改为使用EWS（Exchange Web服务）。

步骤是：

从http://www.microsoft.com/download/en/details.aspx?id=13480
安装
将Microsoft.Exchange.WebServices.dll的引用添加到项目中。你可以在C：\ Program Files（x86）\ Microsoft \ Exchange \ Web Services \ 1.1
使用下面的示例代码作为参考。

使用Microsoft.Exchange.WebServices.Data;

使用System.Security.Cryptography.X509Certificates;

...

ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2007_SP1);

service.Url = new Uri(@"https://"+[Your exchange computer name like: abc.domain.com]+"/EWS/Exchange.asmx"); 

//if have the ip you can get the computer name using the nslookup utility in command line. ->nslookup 192.168.0.90 

ServicePointManager.ServerCertificateValidationCallback =
                    delegate(Object obj, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors)
                    {
                        return true;
                    };

service.Credentials = new WebCredentials([User name: either email or domain account-but without the domain\], "password");

EmailMessage mailmessage = new EmailMessage(service);

mailmessage.From="me@something.com";

mailmessage.ToRecipients.Add("someone@something.com");

mailmessage.Subject = "Hello";

mailmessage.Body = "World";

mailmessage.Body.BodyType = BodyType.HTML; //or text

mailmessage.Send();

Answer 2

脱下袖口，看起来你正在做正确的事情。我有两个建议是在黑暗中刺伤，但你可能想要仔细观察：

因为你得到：The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Client was not authenticated. Stack: at System.Net.Mail.MailCommand ... 我将不得不假设Exchange服务器在解释它正在接收的数据包时遇到问题。

1）这可能是由于SSL加密造成的。我会仔细检查你是否需要SSL。您可以发送（尽管不建议使用）没有SSL的用户名和密码。这将是一个糟糕的服务器设置，但这可能是你无法控制的。

2）您还在进行证书验证回调。这是一个额外的SMTP验证层，可能与SSL数据包冲突。你可以发送没有该行的邮件吗？

我希望这些可以推动你朝着真正的答案前进。

c＃通过交换2K7发送带smtp的邮件

2 个答案: