Как понять, на какой email приходит заявка с сайта, если в обработчике ajax скрипте в url указана ссылка на admin-ajax.php?

<?php
/**
 * WordPress Ajax Process Execution
 *
 * @package WordPress
 * @subpackage Administration
 *
 * @link https://codex.wordpress.org/AJAX_in_Plugins
 */

/**
 * Executing Ajax process.
 *
 * @since 2.1.0
 */
define( 'DOING_AJAX', true );
if ( ! defined( 'WP_ADMIN' ) ) {
  define( 'WP_ADMIN', true );
}

/** Load WordPress Bootstrap */
require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );

/** Allow for cross-domain requests (from the front end). */
send_origin_headers();

// Require an action parameter
if ( empty( $_REQUEST['action'] ) )
  wp_die( '0', 400 );

/** Load WordPress Administration APIs */
require_once( ABSPATH . 'wp-admin/includes/admin.php' );

/** Load Ajax Handlers for WordPress Core */
require_once( ABSPATH . 'wp-admin/includes/ajax-actions.php' );

@header( 'Content-Type: text/html; charset=' . get_option( 'blog_charset' ) );
@header( 'X-Robots-Tag: noindex' );

send_nosniff_header();
nocache_headers();

/** This action is documented in wp-admin/admin.php */
do_action( 'admin_init' );

$core_actions_get = array(
  'fetch-list', 'ajax-tag-search', 'wp-compression-test', 'imgedit-preview', 'oembed-cache',
  'autocomplete-user', 'dashboard-widgets', 'logged-in',
);

$core_actions_post = array(
  'oembed-cache', 'image-editor', 'delete-comment', 'delete-tag', 'delete-link',
  'delete-meta', 'delete-post', 'trash-post', 'untrash-post', 'delete-page', 'dim-comment',
  'add-link-category', 'add-tag', 'get-tagcloud', 'get-comments', 'replyto-comment',
  'edit-comment', 'add-menu-item', 'add-meta', 'add-user', 'closed-postboxes',
  'hidden-columns', 'update-welcome-panel', 'menu-get-metabox', 'wp-link-ajax',
  'menu-locations-save', 'menu-quick-search', 'meta-box-order', 'get-permalink',
  'sample-permalink', 'inline-save', 'inline-save-tax', 'find_posts', 'widgets-order',
  'save-widget', 'delete-inactive-widgets', 'set-post-thumbnail', 'date_format', 'time_format',
  'wp-remove-post-lock', 'dismiss-wp-pointer', 'upload-attachment', 'get-attachment',
  'query-attachments', 'save-attachment', 'save-attachment-compat', 'send-link-to-editor',
  'send-attachment-to-editor', 'save-attachment-order', 'heartbeat', 'get-revision-diffs',
  'save-user-color-scheme', 'update-widget', 'query-themes', 'parse-embed', 'set-attachment-thumbnail',
  'parse-media-shortcode', 'destroy-sessions', 'install-plugin', 'update-plugin', 'crop-image',
  'generate-password', 'save-wporg-username', 'delete-plugin', 'search-plugins',
  'search-install-plugins', 'activate-plugin', 'update-theme', 'delete-theme', 'install-theme',
  'get-post-thumbnail-html', 'get-community-events', 'edit-theme-plugin-file',
  'wp-privacy-export-personal-data',
  'wp-privacy-erase-personal-data',
);

// Deprecated
$core_actions_post_deprecated = array( 'wp-fullscreen-save-post', 'press-this-save-post', 'press-this-add-category' );
$core_actions_post = array_merge( $core_actions_post, $core_actions_post_deprecated );

// Register core Ajax calls.
if ( ! empty( $_GET['action'] ) && in_array( $_GET['action'], $core_actions_get ) )
  add_action( 'wp_ajax_' . $_GET['action'], 'wp_ajax_' . str_replace( '-', '_', $_GET['action'] ), 1 );

if ( ! empty( $_POST['action'] ) && in_array( $_POST['action'], $core_actions_post ) )
  add_action( 'wp_ajax_' . $_POST['action'], 'wp_ajax_' . str_replace( '-', '_', $_POST['action'] ), 1 );

add_action( 'wp_ajax_nopriv_heartbeat', 'wp_ajax_nopriv_heartbeat', 1 );

if ( is_user_logged_in() ) {
  // If no action is registered, return a Bad Request response.
  if ( ! has_action( 'wp_ajax_' . $_REQUEST['action'] ) ) {
    wp_die( '0', 400 );
  }

  /**
   * Fires authenticated Ajax actions for logged-in users.
   *
   * The dynamic portion of the hook name, `$_REQUEST['action']`,
   * refers to the name of the Ajax action callback being fired.
   *
   * @since 2.1.0
   */
  do_action( 'wp_ajax_' . $_REQUEST['action'] );
} else {
  // If no action is registered, return a Bad Request response.
  if ( ! has_action( 'wp_ajax_nopriv_' . $_REQUEST['action'] ) ) {
    wp_die( '0', 400 );
  }

  /**
   * Fires non-authenticated Ajax actions for logged-out users.
   *
   * The dynamic portion of the hook name, `$_REQUEST['action']`,
   * refers to the name of the Ajax action callback being fired.
   *
   * @since 2.8.0
   */
  do_action( 'wp_ajax_nopriv_' . $_REQUEST['action'] );
}
// Default status
wp_die( '0' );

add_action( 'wp_ajax_test_submit', 'test_submit_function' ); 
add_action( 'wp_ajax_nopriv_test_submit', 'test_submit_function' );  

function test_submit_function() {
	$name_from_form 	= $_POST['name'];
	$email_from_form 	= $_POST['email'];
 	$number_from_form 	= $_POST['number'];

	die; 
}

<?php
/**
 * WordPress Ajax Process Execution
 *
 * @package WordPress
 * @subpackage Administration
 *
 * @link https://codex.wordpress.org/AJAX_in_Plugins
 */

/**
 * Executing Ajax process.
 *
 * @since 2.1.0
 */
define( 'DOING_AJAX', true );
if ( ! defined( 'WP_ADMIN' ) ) {
	define( 'WP_ADMIN', true );
}

/** Load WordPress Bootstrap */
require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );

/** Allow for cross-domain requests (from the front end). */
send_origin_headers();

// Require an action parameter
if ( empty( $_REQUEST['action'] ) )
	wp_die( '0', 400 );

/** Load WordPress Administration APIs */
require_once( ABSPATH . 'wp-admin/includes/admin.php' );

/** Load Ajax Handlers for WordPress Core */
require_once( ABSPATH . 'wp-admin/includes/ajax-actions.php' );

@header( 'Content-Type: text/html; charset=' . get_option( 'blog_charset' ) );
@header( 'X-Robots-Tag: noindex' );

send_nosniff_header();
nocache_headers();

/** This action is documented in wp-admin/admin.php */
do_action( 'admin_init' );

$core_actions_get = array(
	'fetch-list', 'ajax-tag-search', 'wp-compression-test', 'imgedit-preview', 'oembed-cache',
	'autocomplete-user', 'dashboard-widgets', 'logged-in',
);

$core_actions_post = array(
	'oembed-cache', 'image-editor', 'delete-comment', 'delete-tag', 'delete-link',
	'delete-meta', 'delete-post', 'trash-post', 'untrash-post', 'delete-page', 'dim-comment',
	'add-link-category', 'add-tag', 'get-tagcloud', 'get-comments', 'replyto-comment',
	'edit-comment', 'add-menu-item', 'add-meta', 'add-user', 'closed-postboxes',
	'hidden-columns', 'update-welcome-panel', 'menu-get-metabox', 'wp-link-ajax',
	'menu-locations-save', 'menu-quick-search', 'meta-box-order', 'get-permalink',
	'sample-permalink', 'inline-save', 'inline-save-tax', 'find_posts', 'widgets-order',
	'save-widget', 'delete-inactive-widgets', 'set-post-thumbnail', 'date_format', 'time_format',
	'wp-remove-post-lock', 'dismiss-wp-pointer', 'upload-attachment', 'get-attachment',
	'query-attachments', 'save-attachment', 'save-attachment-compat', 'send-link-to-editor',
	'send-attachment-to-editor', 'save-attachment-order', 'heartbeat', 'get-revision-diffs',
	'save-user-color-scheme', 'update-widget', 'query-themes', 'parse-embed', 'set-attachment-thumbnail',
	'parse-media-shortcode', 'destroy-sessions', 'install-plugin', 'update-plugin', 'crop-image',
	'generate-password', 'save-wporg-username', 'delete-plugin', 'search-plugins',
	'search-install-plugins', 'activate-plugin', 'update-theme', 'delete-theme', 'install-theme',
	'get-post-thumbnail-html', 'get-community-events', 'edit-theme-plugin-file',
	'wp-privacy-export-personal-data',
	'wp-privacy-erase-personal-data',
);

// Deprecated
$core_actions_post_deprecated = array( 'wp-fullscreen-save-post', 'press-this-save-post', 'press-this-add-category' );
$core_actions_post = array_merge( $core_actions_post, $core_actions_post_deprecated );

// Register core Ajax calls.
if ( ! empty( $_GET['action'] ) && in_array( $_GET['action'], $core_actions_get ) )
	add_action( 'wp_ajax_' . $_GET['action'], 'wp_ajax_' . str_replace( '-', '_', $_GET['action'] ), 1 );

if ( ! empty( $_POST['action'] ) && in_array( $_POST['action'], $core_actions_post ) )
	add_action( 'wp_ajax_' . $_POST['action'], 'wp_ajax_' . str_replace( '-', '_', $_POST['action'] ), 1 );

add_action( 'wp_ajax_nopriv_heartbeat', 'wp_ajax_nopriv_heartbeat', 1 );

if ( is_user_logged_in() ) {
	// If no action is registered, return a Bad Request response.
	if ( ! has_action( 'wp_ajax_' . $_REQUEST['action'] ) ) {
		wp_die( '0', 400 );
	}

	/**
	 * Fires authenticated Ajax actions for logged-in users.
	 *
	 * The dynamic portion of the hook name, `$_REQUEST['action']`,
	 * refers to the name of the Ajax action callback being fired.
	 *
	 * @since 2.1.0
	 */
	do_action( 'wp_ajax_' . $_REQUEST['action'] );
} else {
	// If no action is registered, return a Bad Request response.
	if ( ! has_action( 'wp_ajax_nopriv_' . $_REQUEST['action'] ) ) {
		wp_die( '0', 400 );
	}

	/**
	 * Fires non-authenticated Ajax actions for logged-out users.
	 *
	 * The dynamic portion of the hook name, `$_REQUEST['action']`,
	 * refers to the name of the Ajax action callback being fired.
	 *
	 * @since 2.8.0
	 */
	do_action( 'wp_ajax_nopriv_' . $_REQUEST['action'] );
}
// Default status
wp_die( '0' );

function test_submit_function() {
  $name_from_form 	= $_POST['name'];
  $email_from_form 	= $_POST['email'];
 	$number_from_form 	= $_POST['number'];

  die; 
}

$email_from_form = $_POST['admin_email'];
 	$number_from_form = $_POST['number'];

  $subject = "Заявка с сайта!"; 
  $attachments[] = WP_CONTENT_DIR . '/themes/septic101/check.pdf';
  $html = '
   <p>Введенный адрес почты: '.$email_from_form.'</p> </br>
   <p>Введенный номер телефона:  '.$number_from_form.'</p> </br>
   ';

  $headers[] = 'Content-type: text/html; charset=utf-8'; // в виде массива
  wp_mail($email_from_form, $subject, $html, $headers, $attachments);

  
  echo "Письмо было успешно отправлено на почту!";

  die;

$subject = "Заявка с сайта!";
  $email_from_form = $_POST['email'];
  $emailTo = get_option('admin_email'); // почта из настроек сайта
  $headers = 'From: <'.$email_from_form.'>' . "\r\n" . 'Reply-To: ' . $email_from_form;
  wp_mail( $emailTo, $subject, $headers ); // для теста
  die;