error : The SMTP host was not found

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I am using the below code for sending mail from c# using gmail but I got the error:
"The SMTP host was not".
Please help me..

static bool mailSent = false;


 public void SendMail()
        {
            //Builed The MSG
            System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();
            msg.To.Add("gan@gmail.com");
            msg.To.Add("ganesan@gmail.com");
            msg.From = new MailAddress("ganesan@gmail.com");
            msg.Subject = "Test mail using .net2.0";
            msg.SubjectEncoding = System.Text.Encoding.UTF8;
            msg.Body = "This is my msg Body";
            msg.BodyEncoding = System.Text.Encoding.UTF8;
            msg.IsBodyHtml = false;
            msg.Priority = MailPriority.High;            
           
            //Add the Creddentials
            SmtpClient client = new SmtpClient();
            client.Credentials = new System.Net.NetworkCredential
                ("ganesan@gmail.com", "*******");
            client.Port = 587;//or use 587            
            client.Host = "smtp.gmail.com";
            client.EnableSsl = true;
            client.SendCompleted += new SendCompletedEventHandler(client_SendCompleted);                
            object userState=msg;
            try
            {
                //you can also call client.Send(msg)
                client.SendAsync(msg, userState);   // i am gettint error in this line........             
            }
            catch (System.Net.Mail.SmtpException ex)
            {
                MessageBox.Show(ex.Message, "Send Mail Error");
            }
        }

      void client_SendCompleted(object sender, AsyncCompletedEventArgs e)
       {
           MailMessage mail = (MailMessage)e.UserState;
           string subject = mail.Subject;

           if (e.Cancelled)
           {
               string cancelled = string.Format("[{0}] Send canceled.", subject);
               MessageBox.Show(cancelled);
           }
           if (e.Error != null)
           {
               string error = String.Format("[{0}] {1}", subject, e.Error.ToString());
               MessageBox.Show(error);
           }
           else
           {
               MessageBox.Show("Message sent.");
           }
           mailSent = true;
       }

Posted 19-Apr-11 0:26am

ganesan2510

Updated 19-Apr-11 1:08am

Pong D. Panda

v5

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Rahul VB 11-Mar-14 3:15am

Are you using a PROXY SERVER? check that out first....

6 solutions

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jim lahey · Answer 1 · 2011-04-19T00:42:00

Solution 1

The clue is in the error message.. there is a problem connecting to the SMTP Server, check your connection settings

Posted 19-Apr-11 0:42am

jim lahey

Comments

ganesan2510 19-Apr-11 7:06am

tell me what i have to change in connection

jim lahey 19-Apr-11 7:12am

Without a detailed error message I can't tell you. The problem is located somewhere in these three lines:

client.Port = 587;//or use 587
client.Host = "smtp.gmail.com";
client.EnableSsl = true;

your code can't actually connect to the SMTP server, and these are the three lines that deal with connection specifics.

Pong D. Panda · Answer 2 · 2011-04-19T01:12:00

Solution 3

Add this line of code

client.UseDefaultCredentials = false;

before your

<pre lang="midl">client.Credentials = new System.Net.NetworkCredential
                ("ganesan@gmail.com", "*******");

Posted 19-Apr-11 1:12am

Pong D. Panda

Comments

ganesan2510 20-Apr-11 0:21am

again the same error is coming please help..

Sandeep Mewara · Answer 3 · 2011-04-19T07:10:00

Solution 4

Have a look at this tip: Sending an Email in C# with or without attachments: generic routine.[^]

Posted 19-Apr-11 7:10am

Sandeep Mewara

Nish Nishant · Answer 4 · 2011-04-19T08:25:00

Solution 5

Could be a DNS error too. Can you resolve the SMTP server outside of your app?

Posted 19-Apr-11 8:25am

Nish Nishant

Comments

Rahul VB 28-Mar-14 0:04am

Yes Sir, thats true, i would also like to add "Please dont use proxy server".
Thanks a ton,
Rahul

gailmarboo · Answer 5 · 2013-04-28T20:25:00

Solution 7

You should use SMTP credentials

C#

SmtpServer.Credentials = new System.Net.NetworkCredential("username", "password");
 SmtpServer.EnableSsl = true;

http://csharp.net-informations.com/communications/csharp-smtp-mail.htm[^]

gail

Posted 28-Apr-13 20:25pm

gailmarboo

Rahul VB · Answer 6 · 2014-03-10T00:56:00

Hello Friend,

Firstly, you must PING the host and check if it is available.
Next you must do one thing, check if your internet connection is through a proxy, if so, remove it.

Try this :

protected static string SendEmail(string from,string password,string host,int port,string toAddress,string[] CCAdress,string subject, string body)
        {
            string result = "Message Sent Successfully..!!";
            string senderID = from;// use sender's email id here..
            string senderPassword = password; // sender password here...
            try
            {
                SmtpClient smtp = new SmtpClient
                {
                    Host = host, // smtp server address here...
                    Port = port,
                    EnableSsl = true,
                    DeliveryMethod = SmtpDeliveryMethod.Network,
                    Credentials = new System.Net.NetworkCredential(senderID, senderPassword),
                    Timeout = 30000,
                };
                MailMessage message = new MailMessage(senderID, toAddress, subject, body);
                foreach (string email in CCAdress)
                {
                    message.CC.Add(email);
                }
                    message.Subject = subject;
                smtp.Send(message);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
                result = "Error sending email.!!!";
            }
            return result;
        }

Just try this,.....
From the main method call the above code with correct parameters.....

I would like to thank OG(Original Griff)for this....(i read OG's article...great one).

One doubt:Using Proxy Server....(You wont be able to send an email)...Why?

Thanks

error : The SMTP host was not found

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