PHP code with google reCaptcha not sending email - php

Question

My php webform was working until the point I added an if(isset) and also a reCaptcha.
Help?
Tried to debug the code - could not find an issue
html
<form class = "form-inline d-flex justify-content-center" action="contact.php" method = "post">
<div class="mc-field-group-1">
<input name="name" type="text" placeholder="Name" id="mce-LNAME"/>
</div>
<div class="mc-field-group-2">
<input name = "email" type="text" placeholder="Email address*" class="required email" id="mce-EMAIL" required/>
</div>
<div class="mc-field-group-3">
<input name = "subject" type="text" placeholder="Subject" class="required email" id="mce-EMAIL"/>
</div>
<div class="mc-field-group-4">
<textarea name="message" rows="10" cols="39" placeholder="Your message"></textarea>
</div>
<div class="g-recaptcha" data-sitekey="my_key(have the real key here in my code)"></div>
<div class="clear">
<input type="submit" name="submit" id="mc-embedded-subscribe" class="button" value="Send">
</div>
</form>
php
<?php
if(isset($_POST['submit']))
{
$name = $_POST['name'];
$email = $_POST['email'];
$subject = $_POST['subject'];
$message = $_POST['message'];
$formcontent="From: $name \n Message: $message";
$recipient = "realemail#gmail.com";
$mailheader = "From: $email \r\n";
$secretKey = "my_key(have the real key here in my code)";
$responseKey = $_POST['g-recaptcha-response'];
$UserIP = $_SERVER['REMOTE_ADDR'];
$url = "https://www.google.com/recaptcha/api/siteverify?secret=$secretKey&response=$responseKey&remoteip=$UserIP";
$response = file_get_contents($url);
$response = json_decode($response);
if ($response ->success)
{
mail($recipient, $subject, $formcontent, $mailheader);
echo "Thank You!";
}
else
{
echo "Invalid Captcha, Please Try Again";
}
}
?>
When I click 'Send' in the form takes me to the contact.php page but email not sent to my gmail inbox. Has nothing to do with gmail as I said was working before I tweaked the code to add the reCaptcha.