c# - 发送电子邮件的问题

Question

SMTP 的发送方法总是抛出异常。消息是:发送邮件失败

这是我的代码:

MailMessage mm = new MailMessage();
mm.To.Add("Yuvraj.dhot@xxxxx.co.in");

mm.From = new MailAddress("Kumar.Chaudhari@xxxxx.co.in");
mm.Subject = "Ant Subject";
mm.Body = "Body Cha MEssag here ";

SmtpClient ss = new SmtpClient("localhost");

ss.EnableSsl = false;

try
{
    **ss.Send(mm);**
    Result.Text = "Message Sent";
    Result.ForeColor = System.Drawing.Color.Green;
}
catch (SmtpException ex)
{
    Result.Text = "Message Not Sent : \n\n " + ex.Message;
    Result.ForeColor = System.Drawing.Color.Red;
}

我也试过用

ss.DeliveryMethod = SmtpDeliveryMethod.PickupDirectoryFromIis;

现在它没有抛出任何异常，它执行正常但收件人没有在他的收件箱中收到任何邮件。

我该如何解决这个问题？

编辑 - 这是我得到的堆栈跟踪

    Message=Failure sending mail. Source=System StackTrace: at System.Net.Mail.SmtpClient.Send
(MailMessage message) at WebApplication1._Default.Page_Load(Object sender, EventArgs e) in D:\Emcure-
Kumar\Work\Not in Use\WebApplication1\WebApplication1\Default.aspx.cs:line 30 InnerException: 
System.Net.WebException Message=Unable to connect to the remote server Source=System StackTrace: –
    at System.Net.ServicePoint.GetConnection(PooledStream PooledStream, Object owner, Boolean async,
 IPAddress& address, Socket& abortSocket, Socket& abortSocket6, 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, 
GeneralAsyncDelegate asyncCallback, Int32 creationTimeout)
    at System.Net.Mail.SmtpConnection.GetConnection(String host, Int32 port) at 
System.Net.Mail.SmtpTransport.GetConnection(String host, Int32 port) at 
System.Net.Mail.SmtpClient.GetConnection() at System.Net.Mail.SmtpClient.Send(MailMessage message) 
InnerException: System.Net.Sockets.SocketException Message=No connection could be made because the 
target machine actively refused it 127.0.0.1:25 Source=System ErrorCode=10061 NativeErrorCode=10061

Answer 1

您的执行应该包含比“发送邮件失败”更多的信息

要进行调试，请查看此链接以了解有关 SmtpClient.Send 方法抛出的异常的详细信息 -> SmtpClient.Send Method

此代码适用于“smtp.google.com”

        MailMessage mm = new MailMessage();
        mm.From = new MailAddress("xx");
        mm.To.Add("xx");
        mm.Subject = "Ant Subject"; 
        mm.Body = "Body Cha MEssag here ";

        SmtpClient ss = new SmtpClient();
        ss.Host="smtp.gmail.com";
        ss.Port = 587;
        ss.EnableSsl = true;

        ss.Credentials = new System.Net.NetworkCredential("xx", "xx");
        try 
        { 
            ss.Send(mm); 
            Label1.Text = "Message Sent";
            Label1.ForeColor = System.Drawing.Color.Green; 
        }
        catch (SmtpException ex) 
        { 
            Label1.Text = "Message Not Sent : \n\n " + ex.Message;
            Label1.ForeColor = System.Drawing.Color.Red;
        }

Google 要求启用 SSL 并将端口 587 作为传出端口。您还需要一个 Google 帐户作为凭据。

您的代码没有问题 - 很可能是您的服务器或防火墙