C# – smtp exception “failure sending mail”

cemailsmtp

I am making an SMTP mail application with C#.Net. It is working ok for Gmail settings, but I have to work it for a connection to VSNL. I am getting an exception: "Failure sending mail"

My settings seem perfect. What is the problem? Why am I getting the exception?

MailMessage mailMsg = new MailMessage();
MailAddress mailAddress = new MailAddress("mail@vsnl.net");
mailMsg.To.Add(textboxsecondry.Text);
mailMsg.From = mailAddress;

// Subject and Body
mailMsg.Subject = "Testing mail..";
mailMsg.Body = "connection testing..";

SmtpClient smtpClient = new SmtpClient("smtp.vsnl.net", 25);

var credentials = new System.Net.NetworkCredential("mail@vsnl.net", "password");

smtpClient.EnableSsl = true;
smtpClient.UseDefaultCredentials = false;
smtpClient.Credentials = credentials;
smtpClient.Send(mailMsg);

I am getting an exception following…

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.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)

Best Answer

Check the InnerException of the exception, should tell you why it failed.

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