System.Net.Mail.SmtpException：发送邮件失败。无法从传输连接

Question

这是相关的代码（C＃）

    MailMessage m; 
        SmtpClient client; 

        client.Host = "smtp.mail.yahoo.com"; 
        client.Port = 465; 
        client.EnableSsl = true; 
        client.Credentials = new NetworkCredential("mymail@yahoo.com", "mypassword"); 

        m = new MailMessage(); 
        m.From = new MailAddress("mymail@yahoo.com"); 
        m.To.Add(new MailAddress("anothermail@gmail.com")); 
        m.Subject = "My subject"; 
        m.Body = "This is my body. "; 

        client.Send(m); 

这是完全错误跟踪

System.Net.Mail.SmtpException: Failure sending mail. ---> System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. ---> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host 
    at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags) 
    at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size) 
    --- End of inner exception stack trace --- 
    at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size) 
    at System.Net.DelegatedStream.Read(Byte[] buffer, Int32 offset, Int32 count) 
    at System.Net.BufferedReadStream.Read(Byte[] buffer, Int32 offset, Int32 count) 
    at System.Net.Mail.SmtpReplyReaderFactory.ReadLines(SmtpReplyReader caller, Boolean oneLine) 
    at System.Net.Mail.SmtpReplyReaderFactory.ReadLine(SmtpReplyReader caller) 
    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 EmailSender.EmailSenderForm.send() in c:\Users\Ankur\Documents\Visual Studio 2012\Projects\EmailSender\EmailSender\EmailSenderForm.cs:line 91 

什么我错在这里做读取数据？

Answer 1

据我所知，雅虎不允许第三方邮件客户端操作他们的帐户。这就是为什么您需要使用Thunderbird进行网络邮件扩展的原因。雅虎为这些服务提供Yahoo Mail Plus。您可以使用Gmail中的其他邮件帐户试用您的应用程序吗？在那里它应该工作得很好。

我将这段代码配置为用于发送电子邮件的Outlook帐户。我现在工作了两年，现在没有任何修改。它应该开箱即用（只需更改帐户名称）：

MailMessage mm = new MailMessage(@"example@hotmail.com", 
        dest, textBox1.Text, richTextBox1.Text); 
SmtpClient client = new SmtpClient("smtp.live.com", 587); 
client.Credentials = new NetworkCredential(@"examplehotmail.com", "password"); 
client.EnableSsl = true; 
messageSent = false; 
client.SendAsync(mm, null); 
client.SendCompleted += SentMessageTrigger; 

我希望它有帮助。