SMTP通过SmtpClinet（SmarterEmail服务器）发送邮件失败 [英] SMTP send email failure by SmtpClinet (SmarterEmail server)

问题描述

我已经配置并运行SmarterEmail服务器25端口上运行SMTP服务，配置的电子邮件帐户。

I have configured and running SmarterEmail server, running SMTP service for 25 port, configured email account.

我创建了简单的.NET应用程序通过我的电子邮件服务器发送电子邮件，这是非常简单的：

I've created simple .NET application to send email by my Email server, it is really simple:

        public void SendEmail(EmailMessage message, string username, string password, string host, int port, bool enableSsl)
    {
        MailMessage mm = new MailMessage(message.From, message.To, message.Subject, message.Message);
        NetworkCredential credentials = new NetworkCredential(username, password);

        SmtpClient sc = new SmtpClient(host, 25);
        sc.DeliveryMethod = SmtpDeliveryMethod.Network;
        sc.UseDefaultCredentials = false;
        sc.EnableSsl = enableSsl;
        sc.Credentials = credentials;

        sc.Send(mm);
    }

此应用程序失败，异常：

This application failed with exception:

未处理的异常：System.Net.Mail.SmtpException：失败发送邮件。 --->取值   ystem.Net.WebException：无法连接到远程服务器---> System.Net.S   ockets.SocketException：A连接尝试失败，因为连接的方   没有了一段时间，或已建立的连接FAILE后没有正确答复   ð，因为连接主机未能响应173.248.182.102:25      在System.Net.Sockets.Socket.DoConnect（端点endPointSnapshot，SocketAddre   SS为SocketAddress）      在System.Net.ServicePoint.ConnectSocketInternal（布尔connectFailure，袜子   等S4，S6插座，插座及放大器;插座，ip地址和放大器;地址，ConnectSocketState状态，   IAsyncResult的asyncResult，的Int32超时，异常和放大器;例外）      ---内部异常堆栈跟踪的结尾---      在System.Net.ServicePoint.GetConnection（PooledStream PooledStream，对象流   仪，布尔异步，ip地址和放大器;地址，插座及放大器; abortSocket，插座及放大器; abortSocket   6，的Int32超时）      在System.Net.PooledStream.Activate（对象owningObject，布尔异步，的Int32    超时，GeneralAsyncDelegate的AsyncCallback）      在System.Net.PooledStream.Activate（对象owningObject，GeneralAsyncDelegate    的AsyncCallback）      在System.Net.ConnectionPool.GetConnection（对象owningObject，GeneralAsyncD   elegate的AsyncCallback，的Int32 creationTimeout）      在System.Net.Mail.SmtpConnection.GetConnection（的ServicePoint服务点）      在System.Net.Mail.SmtpTransport.GetConnection（的ServicePoint服务点）      在System.Net.Mail.SmtpClient.GetConnection（）      在System.Net.Mail.SmtpClient.Send（MailMessage消息）      ---内部异常堆栈跟踪的结尾---      在System.Net.Mail.SmtpClient.Send（MailMessage消息）      在SendMail.MailService.SendEmail（EmailMessage消息，字符串username，S饰   NG密码，串主机，端口的Int32，布尔enableSsl）在D：\开发\幻灯   CTS \实验\的SendMail \的SendMail \的Program.cs：行36      在SendMail.Program.Main（字串[] args）在D：\开发\项目\实验   小号\的SendMail \的SendMail \的Program.cs：行52

Unhandled Exception: System.Net.Mail.SmtpException: Failure sending mail. ---> S ystem.Net.WebException: Unable to connect to the remote server ---> System.Net.S ockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection faile d because connected host has failed to respond 173.248.182.102:25 at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddre ss socketAddress) at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Sock et s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Int32 timeout, Exception& exception) --- End of inner exception stack trace --- at System.Net.ServicePoint.GetConnection(PooledStream PooledStream, Object ow ner, Boolean async, IPAddress& address, Socket& abortSocket, Socket& abortSocket 6, Int32 timeout) at System.Net.PooledStream.Activate(Object owningObject, Boolean async, Int32 timeout, GeneralAsyncDelegate asyncCallback) at System.Net.PooledStream.Activate(Object owningObject, GeneralAsyncDelegate asyncCallback) at System.Net.ConnectionPool.GetConnection(Object owningObject, GeneralAsyncD elegate asyncCallback, Int32 creationTimeout) 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) --- End of inner exception stack trace --- at System.Net.Mail.SmtpClient.Send(MailMessage message) at SendMail.MailService.SendEmail(EmailMessage message, String username, Stri ng password, String host, Int32 port, Boolean enableSsl) in D:\Development\Proje cts\Experiments\SendMail\SendMail\Program.cs:line 36 at SendMail.Program.Main(String[] args) in D:\Development\Projects\Experiment s\SendMail\SendMail\Program.cs:line 52

邮件服务器：mail.trackyt.net，端口= 25，SSL = FALSE。它不会从我的（本地）机的工作。

Mail server: mail.trackyt.net, port = 25, SSL = false. It does not work from my (local) machine.

在同一时间，如果我SmarterEmail（远程）运行该应用程序复制到机器，它成功的作品！

In the same time, if I copy this application to machine were SmarterEmail (remote) is running, it successfully works!

我认为这阻止防火墙，启用25远程机器 - 同样的结果。 禁用防火墙，在本地和远程计算机 - 同样的结果

I thought it blocked by Firewall, enabled 25 on remote machine - same result. Disabled Firewall, both locally and remote machine - same result.

其它诊断：

运行SMTP通过 http://pingability.com/smtptest.jsp 测试：

Run SMTP test by http://pingability.com/smtptest.jsp:

EHLO pingability.com   250 MAST-WIN2K8R2-STD你好[207.210.209.134]   250-SIZE 31457280   250-AUTH LOGIN CRAM-MD5   250 OK   DEBUG SMTP：找到扩展大小，ARG31457280   DEBUG SMTP：找到扩展名AUTH，ARGLOGIN CRAM-MD5   DEBUG SMTP：找到扩展名OK，ARG   DEBUG SMTP：尝试进行身份验证   DEBUG SMTP：检查机制：LOGIN PLAIN DIGEST-MD5 NTLM   AUTH LOGIN   334 VXNlcm5hbWU6   c3VwcG9ydA ==   334 UGFzc3dvcmQ6   c3VwcG9ydDEyMw ==   235认证成功

EHLO pingability.com 250-MAST-WIN2K8R2-STD Hello [207.210.209.134] 250-SIZE 31457280 250-AUTH LOGIN CRAM-MD5 250 OK DEBUG SMTP: Found extension "SIZE", arg "31457280" DEBUG SMTP: Found extension "AUTH", arg "LOGIN CRAM-MD5" DEBUG SMTP: Found extension "OK", arg "" DEBUG SMTP: Attempt to authenticate DEBUG SMTP: check mechanisms: LOGIN PLAIN DIGEST-MD5 NTLM AUTH LOGIN 334 VXNlcm5hbWU6 c3VwcG9ydA== 334 UGFzc3dvcmQ6 c3VwcG9ydDEyMw== 235 Authentication successful

它说，SMTP就可以了。

It says that SMTP is OK.

这是我的机器上远程登录：

Telnet from my machine:

微软远程登录> 0 mail.trackyt.net 25   连接到mail.trackyt.net ......无法打开连接到主机，端口   25：连接失败

Microsoft Telnet> o mail.trackyt.net 25 Connecting To mail.trackyt.net...Could not open connection to the host, on port 25: Connect failed

从SmarterMail机相同的telnet就可以了。

Same telnet from SmarterMail machine is OK.

任何想法？

推荐答案

您从家里这样做呢？许多互联网服务供应商阻止传出端口25。

Are you doing this from home? A lot of ISPs block outgoing port 25.

在smartermail您可以添加SMTP侦听另一个端口。试着增加一为587，看看你是否可以连接到它（假设你有管理员权限才能做到这一点）。

In smartermail you can add a SMTP listener for another port. Try adding one for 587, and see if you can connect to it (assuming you have admin rights to do this).

- 戴夫

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