SMTP Server requires a secure connection or client

Question

I am having this issue each time when i try to register new users to my web application. Here is the logic.         "DefaultConnection"  connectionString= "Data Source=GcobaniM-L\SQLEXPRESS;Initial Catalog=eNtsaRegistration;Integrated Security=True"  providerName= "System.Data.SqlClient"  />                    public  Task SendAsync(IdentityMessage message)           {                // Plug in your email service here to send an email.                var mailMessage =  new  MailMessage();               mailMessage.To.Add( new  MailAddress(message.Destination));               mailMessage.From =  new  MailAddress( "ggcobani@gmail.com" );               mailMessage.Subject = message.Subject;               mailMessage.IsBodyHtml =  true ;               mailMessage.Body = message.Body;                using  (var smtp =  new  SmtpClient())               {                   var credential =  new  NetworkCredential                   {                       UserName =  "ggcobani@gmail.com" ,                       Password =  "***"                    };                   smtp.Host =  "smtp.gmail.com" ;                   smtp.Port = 587;                   smtp.EnableSsl =  true ;                   smtp.UseDefaultCredentials =  false ;                   smtp.Credentials = credential;                   smtp.Send(mailMessage);               }                return  Task.FromResult(0);           }       }

Guest User · Answer

Hi    I have followed all these steps, still not working. Its funny this was working just fine. Some instance this works and next get confused, not reseting a password. All apps are turned ON, allow security to third party.

Jignesh Kumar · Answer

Hi,Please use this link,
https://stackoverflow.com/questions/18503333/the-smtp-server-requires-a-secure-connection-or-the-client-was-not-authenticated/38024407
https://stackoverflow.com/questions/20906077/gmail-error-the-smtp-server-requires-a-secure-connection-or-the-client-was-not