The SMTP server requires a secure connection or the client w

Question

using (MailMessage mail = new MailMessage())

{

mail.From = new MailAddress("[email protected]");

mail.To.Add("[email protected]");

mail.Subject = "Hello World";

mail.Body = "<h1>Hello</h1>";

mail.IsBodyHtml = true;

// mail.Attachments.Add(new Attachment("C:\\file.zip"));

using (SmtpClient smtp = new SmtpClient("smtp.gmail.com", 587))

{

smtp.Credentials = new NetworkCredential("[email protected]", "password");

smtp.DeliveryMethod = SmtpDeliveryMethod.Network;

smtp.UseDefaultCredentials = false;

smtp.EnableSsl = true;

smtp.Send(mail);

}

}

 

Error:-

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