sending mail through windows application problem

Question

I have a windows application and i have a smtp exception which states: "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. z8sm5630522wfj.13

at System.Net.Mail.SendmailAsyncResult.End(IAsyncResult result)
at System.Net.Mail.SmtpTransport.EndSendMail(IAsyncResult result)
at System.Net.Mail.SmtpClient.SendMailCallback(IAsyncResult result)"

Please help in this regard. I need it urgently.

Thanks in advance,

Avinash

Krishna Garad · Answer

You are not using network credential. That's the error is occuring just check out the credential as follow. SmtpClient serverobj = new SmtpClient(); serverobj.Credentials = new NetworkCredential(gmailidgmailpwd); serverobj.Port = 25; serverobj.Host = Smtp.gmail.com; serverobj.EnableSsl = true;

Avinash Yoganand · Answer

this is my code for sending mail through gmail using windows application. I have been getting error. also i have tried with attaching file. using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text.RegularExpressions; using System.Windows.Forms; using System.Net.Mail; using System.Net.Mime; namespace MailApplication { public partial class frMailSendingForm : Form { MailMessage msg; static bool mailSent = false; public frMailSendingForm() { InitializeComponent(); } private void txtFrom_TextChanged(object sender EventArgs e) { } private void txtTo_TextChanged(object sender EventArgs e) { } private void btnSend_Click(object sender EventArgs e) { SmtpClient client = new SmtpClient(smtp.gmail.com); string userState = test message; try { MailMessage From = new MailMessage(avinash.iyengar@gmail.com avinash.iyengar@yahoo.co.in Hello This is a test message); MailAddress To = new MailAddress(txtTo.Text.Trim()); msg = new MailMessage(); msg.To.Add(txtTo.Text.Trim()); msg.From = new MailAddress(avinash.iyengar@gmail.com); msg.Body = rtxtMsg.Text.Trim(); msg.BodyEncoding = System.Text.Encoding.UTF8; client.SendCompleted += new SendCompletedEventHandler(client_SendCompleted); client.SendAsync(msg userState); } catch (Exception ex) { MessageBox.Show(ex.Message); } } void client_SendCompleted(object sender AsyncCompletedEventArgs e) { try { if (e.Cancelled) { string cancelled = string.Format(Send canceled); MessageBox.Show(cancelled); } if (e.Error != null) { string error = string.Format(e.Error.ToString()); MessageBox.Show(error); } else { MessageBox.Show(Message Sent Successfully); } mailSent = true; msg.Dispose(); } catch (Exception ex) { MessageBox.Show(ex.Message Error); } } private void SendCompletedCallback(object sender AsyncCompletedEventArgs e) { string token = (string)e.UserState; if (e.Cancelled) { MessageBox.Show([{0}] Send canceled token); } if (e.Error != null) { } else { MessageBox.Show(Message sent); } mailSent = true; } private void txtSubject_TextChanged(object sender EventArgs e) { txtFrom.Text = txtSubject.Text.Trim(); } static void AttachmentFromFile() { MailMessage mail = new MailMessage(); mail.From = new MailAddress(avinash.iyengar@gmail.com); mail.To.Add(avinash.iyengar@yahoo.co.in); mail.Subject = This is a test mail; mail.Body = this is a test mail; mail.Attachments.Add(new Attachment(C:\Users\Avinash\Documents\Desktop\gopi sir mail id.txt)); SmtpClient smtp = new SmtpClient(smtp.gmail.com); smtp.Credentials = new System.Net.NetworkCredential(avinash.iyengar@gmail.com mypassword); smtp.Send(mail); } } } Please help me with this

Krishna Garad · Answer

For code just check out the articles on right hand side of this thread. It will help you else upload u r code then we can check it.

Avinash Yoganand · Answer

i checked with credentials and again the same error. Please help me with the code. Also i wanted code for attaching files and sending mail via the same windows application.

Krishna Garad · Answer

It's might be cause of your credential please check out the credential you are using.