$from = "no-reply@mydomain.net";
 $port = "587";
 $to=$d_uname;
 $host = "smtp.sendgrid.net";
 $username = "username";
 $password = "password";

         $headers = array ('From' => $d_replyto,
           'To' => $to,
           'Subject' => $d_subject,
       'MIME-Version' => "1.0",
       'Content-type' => "text/plain; charset=utf-8",
     );
         $smtp = Mail::factory('smtp',
           array ('host' => $host,
             'port' => $port,
             'auth' => true,
             'username' => $username,
             'password' => $password));

 #Email it
 if (PEAR::isError($smtp)) {
     error_log("<p>" . $smtp->getMessage() . "</p>");
    }
 $mail = $smtp->send($to, $headers, $d_message);

authentication failure [SMTP: STARTTLS failed (code: 220, response: Begin TLS negotiation now)]

else{         // if $fp does exist
  stream_context_set_option($fp, 'ssl', 'verify_peer', false);
  stream_context_set_option($fp, 'ssl', 'allow_self_signed', true);
  stream_context_set_option($fp, 'ssl', 'verify_peer_name', false);
    }