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I am using poco library to send a email

first I installed the libraries on my ubuntu

sudo apt-get install libpoco-dev

code

using namespace Poco::Net;

int main (int argc, char **argv)
{
try
{
    MailMessage msg;
    msg.addRecipient (MailRecipient (MailRecipient::PRIMARY_RECIPIENT,
                                   "john@gmail.com",
                                   "John"));

    msg.setSender ("Anthony Smiths <anthonysmiths5456@gmail.com>");

    msg.setSubject ("sending a email using POCO library");
    msg.setContent ("Hi, this is a test email");

    SMTPClientSession smtp ("smtp.gmail.com"); 
    smtp.login ();
    smtp.sendMessage (msg);
    smtp.close ();
    std::cerr << "Sent mail successfully!" << std::endl;
  }
  catch (std::exception &e)
  {
      std::cerr << "failed to send mail: " << e.what() << std::endl;
      return EXIT_FAILURE;
  }
  return EXIT_SUCCESS;
}

However after I compile and do ./a.out, it display this error

fail to send email: SMTP Exception.

Please help

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