How can I solve the SMTP server require a secure connection

Question

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The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required.

i have also converted my gmail account as less secured account but it's not working.

What I have tried:

i have used below code to send email to the user by my email like abc@gmail.com

MailMessage msg = new MailMessage();
                SmtpClient smtp = new SmtpClient();
                MailAddress from = new MailAddress("abc@gmail.com");
                StringBuilder sb = new StringBuilder();
                msg.IsBodyHtml = true;
                smtp.Host = "smtp.gmail.com";
                smtp.Port = 587;
                msg.To.Add(model.Email);
                msg.From = from;
                msg.Subject = "Registration success full on VibExchange ! ";
                msg.Body += " <html>";
                msg.Body += "<body>";
                msg.Body += "<table>";
                msg.Body += "<tr>";
                msg.Body += "<td>Thank you for registering on VibExChange. Your User Name and Password is : </td>";
                msg.Body += "</tr>";
                msg.Body += "<tr>";
                msg.Body += "<td>User Name : </td><td>" + model.UserName + "</td>";
                msg.Body += "</tr>";
                msg.Body += "<tr>";
                msg.Body += "<td>Password : </td><td>" + model.Password + "</td>";
                msg.Body += "</tr>";
                msg.Body += "<tr>";
                msg.Body += "<td>Email Pin : </td><td>" + EmailVerification.ToString() + "</td>";
                msg.Body += "</tr>";
                msg.Body += "<tr>";
                msg.Body += "<td>for Email Verification </td><td><a href='http://www.vibration-service.com/Home/EmailVerification'> Click Here </a></td>";
                msg.Body += "</tr>";
                msg.Body += "<td>for more information </td><td><a href='www.vibration-service.com'> Click Here </a></td>";
                msg.Body += "</tr>";
                msg.Body += "</table>";
                msg.Body += "</body>";
                msg.Body += "</html>";
                smtp.UseDefaultCredentials = false;
                smtp.EnableSsl = true;
                smtp.Credentials = new NetworkCredential("abc@gmail.com", "1857");

                smtp.Send(msg);
                msg.Dispose();

Posted 4-Oct-20 6:14am

Member 14743579

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Comments

Richard MacCutchan 4-Oct-20 12:30pm

Google requires secure authentication for users of its SMTP service.

Member 14743579 4-Oct-20 12:52pm

any changes required in this code so please tell me or you have other solution for my code or problem then suggest me and how can i give a google secure authentication for users of its smtp service.

Richard MacCutchan 4-Oct-20 12:53pm

This question has been answered many times - look at the links on the right of this page.

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