c# 通过 exchange 2K7 使用 smtp 发送邮件

Question

以下代码在通过 gmail 的 smtp 而不是通过 exchange 2K7 发送时有效。 在同一台机器上，我有 outlook express，它确实通过交换成功发送。 我在我的代码中使用与 outlook express 相同的配置，但不断收到错误消息:

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，我得到了这个错误:

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。不要尝试将 smtp 与 exchange 2K7 及更高版本一起使用。请改用 EWS(Exchange Web 服务)。

步骤是:

1. 从 http://www.microsoft.com/download/en/details.aspx?id=13480 下载 EWS 托管 API
2. 安装
3. 将对 Microsoft.Exchange.WebServices.dll 的引用添加到您的项目中。你会在 C:\Program Files (x86)\Microsoft\Exchange\Web Services\1.1 中找到它

4. 使用下面的示例代码作为引用。

   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();

希望对你有帮助。