Sendgrid 202 - email not being sent - php

Question

On submitting a form I receive a status code of 202 (response received, email is queued for delivery), with "Form successfully sent" but the email never gets sent.
I've tried re-creating my API key, and have not found an explanation for this behavior from the API.
Is there a workaround to this scenario?
<?php
require("sendgrid-php/sendgrid-php.php");
// an email address that will be in the From field of the email.
$from = 'Demo contact form <test#example.com >';
// an email address that will receive the email with the output of the form
$to = 'Demo contact form <test#example.com>';
// subject of the email
$name = $_POST['name'];
$subject = $_POST['subject'];
$message = $_POST['message'];
// form field names and their translations.
// array variable name => Text to appear in the email
$fields = array('name' => 'Name', 'email' => 'Email', 'phone' => 'Phone', 'subject' => 'Subject', 'message' => 'Message');
// message that will be displayed when everything is OK :)
$okMessage = 'Contact form successfully submitted. Thank you, I will get back to you soon!';
// If something goes wrong, we will display this message.
$errorMessage = 'There was an error while submitting the form. Please try again later';
/*
* LET'S DO THE SENDING
*/
// if you are not debugging and don't need error reporting, turn this off by error_reporting(0);
error_reporting(E_ALL & ~E_NOTICE);
try
{
if(count($_POST) == 0) throw new \Exception('Form is empty');
$content = "You have a new message from your contact form\n=============================\n";
foreach ($_POST as $key => $value) {
// If the field exists in the $fields array, include it in the email
if (isset($fields[$key])) {
$content .= "$fields[$key]: $value\n";
}
}
/* All the necessary headers for the email.
$headers = array('Content-Type: text/plain; charset="UTF-8";',
'From: ' . $from,
'Reply-To: ' . $from,
'Return-Path: ' . $from,
);
*/
// Send email
//mail($to, $subject, $content, implode("\n", $headers));
//recaptcha-response
$recaptcha_secret = "6LfK7ygUAAAAAIYzE6mbqdxbmuroi4gJWqdIpmBu";
$response = file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret=".$recaptcha_secret."&response=".$_POST['g-recaptcha-response']);
$response = json_decode($response, true);
if($response["success"] === true){
$from = new SendGrid\Email("Nami19", "namitajamwal19#gmail.com");
// $subject = "Sending with SendGrid is Fun";
// $subject = $_POST['subject'];
$subject= "You have got mail!";
$to = new SendGrid\Email("Example User", "etest549#gmail.com");
$content = new SendGrid\Content("text/html", "
Email : {$email}<br>
Name: {$name}<br>
Subject : {$subject}<br>
Message : {$message}
");
// $content = $_POST["content"];
// $content = $_POST['content'];
$mail = new SendGrid\Mail($from, $subject, $to, $content);
$apiKey = ('SG.4J8IyicKTRqOcu7rOUmJXQ.mLk27ighheFPG4wDF63b5JboXvpGJFZMe');
$sg = new \SendGrid($apiKey);
$sg_response = $sg->client->mail()->send()->post($mail);
echo $sg_response->statusCode();
print_r($sg_response->headers());
echo $sg_response->body();
echo "Form Submit Successfully.";
}else{
echo "You are a robot";
}
// $responseArray = array('type' => 'success', 'message' => $okMessage);
}
catch (\Exception $e)
{
$responseArray = array('type' => 'danger', 'message' => $errorMessage);
}
/*
if requested by AJAX request return JSON response
if (!empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest') {
$encoded = json_encode($responseArray);
header('Content-Type: application/json');
echo $encoded;
}
// else just display the message
else {
echo $responseArray['message'];
}
*/
?>