Error 504 when sending form data from website to email - php

Question

I am trying to send a data from a form to my email.
I try using the form in my server (free hosting) and it is fine. When I try to use it on another server (runs through cloudflare ) it gives me 504 gateway error. Any idea why?
Is it on my side or do I have to fix something?
My server page : http://mywg1.x10host.com/m1/
Cloudflare run page : http://wholesaledrywalltoronto.therenopros.ca/
the PHP for the form :
<?php
if(isset($_POST['Email'])) {
// EDIT THE 2 LINES BELOW AS REQUIRED
$email_to = "email.x#gmail.com";
$email_subject = "Drywall Pros Form";
function died($error) {
// your error code can go here
echo "We are very sorry, but there were error(s) found with the form you submitted. ";
echo "These errors appear below.<br /><br />";
echo $error."<br /><br />";
echo "Please go back and fix these errors.<br /><br />";
die();
}
// validation expected data exists
if(!isset($_POST['Name']) ||
!isset($_POST['Email']) ||
!isset($_POST['Phone']) ||
!isset($_POST['comments'])) {
died('We are sorry, but there appears to be a problem with the form you submitted.');
}
$Name = $_POST['Name']; // required
$Email = $_POST['Email']; // required
$Phone = $_POST['Phone']; // not required
$comments = $_POST['comments']; // required
$error_message = "";
$string_exp = "/^[A-Za-z .'-]+$/";
if(!preg_match($string_exp,$Name)) {
$error_message .= 'The First Name you entered does not appear to be valid.<br />';
}
if(strlen($comments) < 2) {
$error_message .= 'The Comments you entered do not appear to be valid.<br />';
}
if(strlen($error_message) > 0) {
died($error_message);
}
$email_message = "Form details below.\n\n";
function clean_string($string) {
$bad = array("content-type","bcc:","to:","cc:","href");
return str_replace($bad,"",$string);
}
$email_message .= "First Name: ".clean_string($Name)."\n";
$email_message .= "Email: ".clean_string($Email)."\n";
$email_message .= "Phone: ".clean_string($Phone)."\n";
$email_message .= "Comments: ".clean_string($comments)."\n";
// create email headers
$headers = 'From: '.$email_from."\r\n".
'Reply-To: '.$email_from."\r\n" .
'X-Mailer: PHP/' . phpversion();
mail($email_to, $email_subject, $email_message, $headers);
?>
<!-- include your own success html here -->
Thank you for contacting us. We will be in touch with you very soon.
<?php
}
?>

Answer 1

Fixed it . For anyone who is having same errors . It is probably because the server you are working with only allows SMTP and not the PHP mail function.