无法从Win7的Windows服务发送SMTP电子邮件 [英] Cannot send SMTP email from windows service on Win7

问题描述

我正在使用c＃.NET 4.0编写Windows服务（我的开发工作站是Windows 7）。
目的是在处理过程中发送错误时直接发送电子邮件。
我已经添加了一个代码片段来显示我想要实现的内容：

  try 
 { 
 string emailAddresses =[e-mail]; 
 string emailCCAddresses =[e-mail]; 
 
 //发送电子邮件
使用（MailMessage mailMsg = new MailMessage（））
 {
 mailMsg.To.Add（emailAddresses）; 
 mailMsg.From = new MailAddress（[e-mail]）; 
 mailMsg.CC.Add（emailCCAddresses）; 
 mailMsg.Subject =错误消息; 
 mailMsg.Body = DateTime.Now +：无效文件遇到。 ; 
 
 ////使用（Attachment data = new Attachment（C：\\\usus\\sample.xml，MediaTypeNames.Application.Octet）创建文件附件
 ））
 {
 //为文件添加时间戳信息
 ContentDisposition disposition = data.ContentDisposition; 
 disposition.ModificationDate = File.GetLastWriteTime（C：\\\users\\sample.xml）; 
 mailMsg.Attachments.Add（data）; 
 
 SmtpClient emailClient = new SmtpClient（example.Sample.com，25）; 
 emailClient.DeliveryMethod = SmtpDeliveryMethod.Network; 
 emailClient.UseDefaultCredentials = true; 
 emailClient.Send（mailMsg）; 
} 
} //结束使用
 
} 
 catch（异常e）
 {
 Console.WriteLine（e.ToString（） ）; 
} 
  

我所面临的问题是 - 电子邮件选项无法从赢服务于任何Windows 7机器。然而，完全相同的代码将在Win XP机器上正常工作。警告，这不能作为控制台应用程序测试。它需要作为服务运行才能看到行为。我将相同的代码放在控制台应用程序中，并且在我的win 7机器上运行正常。

此外，我启用了telnet客户端和服务器窗口功能，并且能够通过命令提示符成功发送电子邮件。

我尝试了一些事情来尝试隔离原因（没有工作） -

• 明确设置NetworkCredential并设置UseDefaultCredentials = false。
  emailClient.Credentials = new System.Net.NetworkCredential（username，pwd，Domain1）;




• 更改登录作为服务的选项是我的用户标识和pwd



• From和To电子邮件地址是真实的，而不是虚拟地址（在我的真实代码中！）

我可以找到唯一的区别是Windows服务安装在本地系统帐户下。但是，将登录更改为应该会导致它使用我的验证详细信息/代码中指定的凭据。我办公室的IT人员说，他看到的唯一的区别是我的消息是作为一个中继发送的（不知道这是什么意思，从/到并登录为帐户，当更新到我的登录没有改变结果） p>

我看到被捕获的异常是：

抛出SMTP异常：System.Net .Mail.SmtpException：发送邮件失败。 ---> System.Net.WebException：无法连接到远程服务器---> System.Net.Sockets.SocketException：尝试以禁止其访问权限XXX.XXX.XXX的方式访问套接字.XXX XX
在System.Net.Sockets.Socket.DoConnect（EndPoint endPointSnapshot，SocketAddress socketAddress）
在System.Net.ServicePoint.ConnectSocketInternal（Boolean connectFailure，Socket s4，Socket s6，Socket& socket， IP地址和地址，ConnectSocketState状态，IAsyncResult asyncResult，Int32超时，异常和异常）

任何想法都赞赏！

我觉得它与Windows 7安全策略/功能有关，希望可能像更改默认设置一样简单。

解决方案

您可以作为当前用户运行服务。只需选择服务安装程序中的选项USER，它将作为当前用户工作。我今天遇到了同样的错误，我发现了这个解决方案。我希望对任何人都有帮助。

I am writing a Windows service using c# .NET 4.0 (my development workstation is Windows 7). The aim is to send an email from the service directly in case of errors during processing. I've included a code snippet to show what i am trying to achieve:

try
        {
                string emailAddresses = "[e-mail]";
                string emailCCAddresses = "[e-mail]";

                //Send the email
                using (MailMessage mailMsg = new MailMessage())
                {
                    mailMsg.To.Add(emailAddresses);
                    mailMsg.From = new MailAddress("[e-mail]");
                    mailMsg.CC.Add(emailCCAddresses);
                    mailMsg.Subject = " Error Message ";
                    mailMsg.Body = DateTime.Now + " : Invalid File Encountered." ;

                    ////Creating the file attachment
                    using (Attachment data = new Attachment("C:\\users\\sample.xml", MediaTypeNames.Application.Octet))
                    {
                        //Add timestamp info for the file
                        ContentDisposition disposition = data.ContentDisposition;
                        disposition.ModificationDate = File.GetLastWriteTime("C:\\users\\sample.xml");
                        mailMsg.Attachments.Add(data);

                    SmtpClient emailClient = new SmtpClient("example.Sample.com", 25);
                    emailClient.DeliveryMethod = SmtpDeliveryMethod.Network;
                    emailClient.UseDefaultCredentials = true;
                    emailClient.Send(mailMsg);
                    }
                }//end using

            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }

The issue i am facing is - the email option does not work from a win service on any windows 7 machine. However the exact same code will work on a Win XP machine perfectly fine. Caveat, this cannot be tested as a console app. It needs to be run as a service to see the behavior. I put the same code in a console application and it worked fine on my win 7 machine.

Additionally, i enabled the telnet client and server windows features and was able to send email via the command prompt successfully.

I tried a few things to try and isolate the cause (none worked) -

• Setting the NetworkCredential explicitly and setting UseDefaultCredentials = false. emailClient.Credentials = new System.Net.NetworkCredential("username","pwd","Domain1");

• changing the Log On As option of the service to be my userid and pwd

• The From and To email addresses are authentic, not dummy addresses(in my real code that is!)

The only differences i can find is that the windows service is installed under the local system account. But changing the log on as should have caused it to use my authentication details/the credentials specified in the code. The IT guy in my office said the only difference he saw was that my message was sent as a relay(not sure what this means as the from/to and log on as accounts when updated to my login did not change the outcome)

the exception i see being caught is :

SMTP Exception thrown : System.Net.Mail.SmtpException: Failure sending mail. ---> System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: An attempt was made to access a socket in a way forbidden by its access permissions XXX.XXX.XXX.XXX XX at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress) at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Int32 timeout, Exception& exception)

Any ideas are appreciated!

I feel it has to do with a windows 7 security policy/feature and hopefully might be as simple as changing a default setting.

解决方案

You can run service as current user. Just select option USER in service installer and it will work as current user. I got the same error today and I found this solution. I hope it will be helpful for anybody.

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