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Error while sending email using ASP.NET 2.0 -'System.Net.Mail.SmtpException: Failure sending mail

'System.Net.Mail.SmtpException: Failure sending mail. ---> System.IO.IOException: Unable to read data from the transport connection: net_io_connectionclosed.   at System.Net.Mail.SmtpReplyReaderFactory.ProcessRead(Byte[] buffer, Int32 offset, Int32 read, Boolean readLine)   at System.Net.Mail.SmtpReplyReaderFactory.ReadLines(SmtpReplyReader caller, Boolean oneLine)   at System.Net.Mail.SmtpReplyReaderFactory.ReadLine(SmtpReplyReader caller)   at System.Net.Mail.SmtpReplyReader.ReadLine()   at System.Net.Mail.CheckCommand.Send(SmtpConnection conn, String& response)   at System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[] command, String from)   at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception)   at System.Net.Mail.SmtpClient.Send(MailMessage message)   --- End of inner exception stack trace ---   at System.Net.Mail.SmtpClient.Send(MailMessage message) 

 i tried many things but still awaiting solution


svk

 

sometimes  i get this error

 'System.Net.Mail.SmtpException: Failure sending mail. ---> System.Net.WebException: The remote name could not be resolved: 'smtp.mail.yahoo.com'   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)   --- End of inner exception stack trace ---   at System.Net.Mail.SmtpClient.Send(MailMessage message)


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