email sending problem

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MailMessage mm = new MailMessage();
     mm.To.Add(receiver);
     mm.Body = body;
     mm.From = new MailAddress("feedback@delwyntech.com");
     mm.Subject = sub;
     try
     {
         Ping ping = new Ping();
         PingReply pingreply = ping.Send("gmail.com");
         string x = pingreply.Status.ToString();
         if (x == "Success")
         {
             SmtpClient smtp = new SmtpClient();
             try
             {
                 smtp.Host = "smtpout.secureserver.net";
                 smtp.EnableSsl = true; //Depending on server SSL Settings true/false
                 System.Net.NetworkCredential NetworkCred = new System.Net.NetworkCredential();
                 NetworkCred.UserName = "feedback@gowyn.com";
                 NetworkCred.Password = "password";
                 smtp.Credentials = NetworkCred;
                 smtp.UseDefaultCredentials = true;
                 smtp.Port = 465;//Specify your port No;
                 smtp.Send(mm);

Exception Detail:

System.Net.Mail.SmtpException was caught
  Message=Failure sending mail.
  Source=System
  StackTrace:
       at System.Net.Mail.SmtpClient.Send(MailMessage message)
       at db_fn.sendemail(String body, String sub, String sender, String receiver) in c:\Users\Administrator\Dropbox\crm\App_Code\db_fn.cs:line 225
  InnerException: System.IO.IOException
       Message=Unable to read data from the transport connection: net_io_connectionclosed.
       Source=System
       StackTrace:
            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(ServicePoint servicePoint)
            at System.Net.Mail.SmtpTransport.GetConnection(ServicePoint servicePoint)
            at System.Net.Mail.SmtpClient.GetConnection()
            at System.Net.Mail.SmtpClient.Send(MailMessage message)
       InnerException:

Plz help me out..!!!!!!

Posted 9-Mar-13 3:52am

Sanjeev236

Updated 9-Mar-13 4:02am

v2

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[no name] 9-Mar-13 9:57am

Please post the real error message that you are getting, along with the stack trace and identify the line of code that is getting the error. Unless you are really getting an SQL error, then post that code instead.

Sanjeev236 9-Mar-13 10:02am

thnaks.. question modified..!!

4 solutions

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charles henington · Answer 1 · 2013-03-09T15:36:00

Solution 2

mike meinz is correct the UseDefaultCredentials should be false. Aside from that I would check the port as well the most commonly used ports are 10, 25, 110 465, and 587. I have personally had more luck with port 587.

Posted 9-Mar-13 15:36pm

charles henington

Comments

Sanjeev236 10-Mar-13 0:07am

changes defaultcredentials to false..but still problem persists.
tried other ports too... and for further info,same port 465 is working great in outlook.!!!!

Mike Meinz 10-Mar-13 10:14am

Sorry. The only other thing I can think of is maybe the login id NetworkCred.UserName should just be the username part of the email address and not include the @domainname part.

charles henington 11-Mar-13 6:53am

not sure but i know in most cases the @domainname part must be included.
also ive noticed that you call the smtp.UseDefaultCredentials = false; after you specify the NetworkCredentials try calling the UseDefaultCredentials = false before you change the Credentials when i sent a message with gmail it must be done in this manner or an error will be thrown

charles henington · Answer 2 · 2013-03-11T22:58:00

C#

private void button1_Click(object sender, EventArgs e)
        {
            string reciever = "recipent";
            string subject = "subject";
            string body = "body";
            try
            {
                using (MailMessage message = new MailMessage("feedback@delwyntech.com", reciever)
                {
                    Subject = subject,
                    Body = body
                })
                {
                    using (SmtpClient client = new SmtpClient("smtpout.secureserver.net", 465)
                    {
                        EnableSsl = true,
                        UseDefaultCredentials = false,
                        Credentials = new NetworkCredential("feedback@gowyn.com", "password")
                    })
                    {
                        client.Send(message);
                    }
                }
            }
            catch (Exception mailException)
            {
                // if an exception is thrown display exception message for debug  purposes
                MessageBox.Show(mailException.Message);
            }
        }

Mike Meinz · Answer 3 · 2013-03-09T10:09:00

I found these two documentation items. Maybe one or both of these will help you solve this problem.

The documentation for SmtpClient.EnableSsl Property[^] says:
If the EnableSsl property is set to true, and the SMTP mail server does not advertise STARTTLS in the response to the EHLO command, then a call to the Send or SendAsync methods will throw an SmtpException.

The documentation for SmtpClient.UseDefaultCredentials Property[^] says:
Set this property to true when this SmtpClient object should, if requested by the server, authenticate using the default credentials of the currently logged on user. For client applications, this is the desired behavior in most scenarios.
The tag for your question says ASP.NET so it is not a Client Application. Perhaps UseDefaultCredentials should be False since you are supplying the credentials.

abhinavvijay · Answer 4 · 2013-04-20T08:05:00

SmtpClient ss = new SmtpClient();
               ss.Host = "relay-hosting.secureserver.net";
                ss.Port = 25;
                ss.Timeout = 10000;
                ss.DeliveryMethod = SmtpDeliveryMethod.Network;
                ss.UseDefaultCredentials = false;
                ss.Credentials = new NetworkCredential("your_full_emailAddress", "YourPassword", "your_Domain");
                ss.EnableSsl = false;
 
                MailMessage mailMsg = new MailMessage("your_full_emailAddress", "demo@gmail.com", "subject here", "my body");
                mailMsg.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
                ss.Send(mailMsg);
 
                Response.Write("Mail Sent");

email sending problem

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Solution 1

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