jquery ajax giving all page as response code example

Example 1: ajax response returns entire page

Use condition to verify if $_POST empty in you main page or index.php to not send the whole page in response ajax
and verif your AJAX URL
 $.ajax({
             type:"POST",
             url:"http://mywebsite.com/php/send_email.php",
   .......
   
index.php
------------------------
<?php 
if(empty($_POST)){ ?>

//
<html>
the header pages
the body
the include pages
the scripts pages
the footer
<?php } ?>

Example 2: jquery ajax post

$.ajax({
  type: "POST",
  url: url,
  data: data,
  success: success,
  dataType: dataType
});