how to solve the error in email sending

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i hv a error
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Must issue a STARTTLS command first. kr4sm12198444pbc.76
durin sending email

.cs

C#

NetworkCredential nt = new NetworkCredential("*************@gmail.com", "12345678");
                   string usermail = ds.Tables[0].Rows[0][0].ToString();
                   string passwd = ds.Tables[0].Rows[0][1].ToString();
                   MailMessage mail = new MailMessage();
                   SmtpClient smtp = new SmtpClient();
                   smtp.Credentials = nt;
                   mail.From = new MailAddress(Text2.Value);
                   mail.To.Add(new MailAddress(usermail));
                   mail.IsBodyHtml = true;
                   mail.Subject = "Password";
                   mail.Body = "Your password is : " + passwd + "";
                   smtp.Host = "smtp.gmail.com";
                   smtp.Port = 587;
                   smtp.Send(mail);//here is error
                   lbl.Visible = true;
                   lbl.Text = "password sent successfully";
                   mail.To.Clear();
                   mail.Dispose();

what should i do....

Posted 16-Oct-12 23:10pm

Rashid Choudhary

Updated 17-Oct-12 0:04am

AshishChaudha

v2

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4 solutions

Solution 2

Please do not use Gmail for testing. Use your own local email server, like HmailServer, which is free.

Posted 16-Oct-12 23:32pm

TorstenH.

Solution 3

C#

MailMessage message = new MailMessage();



            message.From = new MailAddress("Ngqandu.Anele@gmail.com");

            message.To.Add(new MailAddress("Anele.Ngqandu@live.nmmu.ac.za"));

            message.Subject = subject.Text;

            message.Body = body.Text;



            SmtpClient client = new SmtpClient();

            client.Credentials = new System.Net.NetworkCredential("Ngqandu.Anele@gmail.com", "password");



            client.Port = 587;

            client.Host = "smtp.gmail.com";

            client.EnableSsl = true;

            try

            {

                client.Send(message);

            }

            catch (Exception ex)

            {

                System.Windows.Forms.MessageBox.Show(ex.Message);

            }

Posted 16-Oct-12 23:45pm

Anele Ngqandu

Solution 4

easy code for sending main

C#

protected void Button1_Click(object sender, EventArgs e)
  {

      str = "Department :" + DropDownList1.SelectedItem;
      str = str + "\nName : " + TextBox1.Text;
      str = str + "\nEmail : " + TextBox2.Text;
      str = str + "\nContact : " + TextBox3.Text;


      try
      {

          Email("dksingh6788@gmail.com", "dksingh6788@gmail.com", str);
          Label6.Visible = true;
      }
      catch { }

  }

  public bool Email(string strFrom, string strTo, string strMessage)
  {
      try
      {
          if (strFrom.Trim() != "" && strTo.Trim() != "" && strFrom.Trim() != null && strTo.Trim() != null)
          {
              System.Net.Mail.MailMessage objMailMessage = new System.Net.Mail.MailMessage();
              objMailMessage.Body = strMessage;
              objMailMessage.BodyEncoding = System.Text.Encoding.UTF8;
              objMailMessage.IsBodyHtml = false;
              objMailMessage.From = new MailAddress(strFrom, "New Enquiry", System.Text.Encoding.UTF8);
              objMailMessage.To.Add(new MailAddress(strTo));
              //objMailMessage.CC.Add(new MailAddress(strTo));
              objMailMessage.Subject = "Registration Request";
              objMailMessage.SubjectEncoding = System.Text.Encoding.UTF8;
              objMailMessage.Priority = MailPriority.High;
              //if (FileUpload1.HasFile)
              //{
              //    objMailMessage.Attachments.Add(new Attachment(FileUpload1.PostedFile.InputStream, FileUpload1.FileName));
              //}

              try
              {

                  System.Net.Mail.SmtpClient objSMTPClient = new System.Net.Mail.SmtpClient();
                  objSMTPClient.Credentials = new System.Net.NetworkCredential(strFrom, "lalakidukan");
                  //objSMTPClient.Credentials = objSMTPClient.Credentials.GetCredential(objSMTPClient.Host, objSMTPClient.Port, "Digest");
                  objSMTPClient.Port = 587;
                  objSMTPClient.Host = "smtp.gmail.com";
                  objSMTPClient.EnableSsl = true;
                  //objSMTPClient.DeliveryMethod = SmtpDeliveryMethod.Network;
                  objSMTPClient.Send(objMailMessage);

              }
              catch (Exception ex)
              {
                  return false;
              }
              Label6.Visible = false;
              TextBox1.Text = "";
              TextBox2.Text = "";
              TextBox3.Text = "";

          }
      }
      catch (Exception ex)
      {
          return false;
      }
      return true;
  }

Posted 17-Oct-12 2:03am

Devendra 1988

Updated 23-Oct-12 7:14am

v2

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Sumit_Kumar_Sinha · Accepted Answer · 2012-10-16T23:16:00

private void MailSendThruGmail()
    {
        MailAddress fromAddress = new MailAddress("sender@gmail.com", "From Name");
        MailAddress toAddress = new MailAddress("recipient@gmail.com", "To Name");
        const string subject = "test";
        const string body = @"Using this feature, you can send an e-mail message from an application very easily.";

        System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage(fromAddress.Address, toAddress.Address, subject, body);
        msg.IsBodyHtml = true;

        var client = new SmtpClient("smtp.gmail.com", 587)
        {
            Credentials = new NetworkCredential("username", "password"),
            EnableSsl = true
        };

        try
        {
            client.Send(msg);
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.ToString());
        }
    }