<?php

function ars_send_message_for_admin()
{
    $to         = get_option('admin_email');
    $subject    = $_POST['subject'];
    $message    = "From: {$_POST['name']} <{$_POST['from']}>\r\n\r\n{$_POST['message']}";
    $headers    = [
        "Content-Type: text/plain; charset=UTF-8",
        "Reply-To: {$_POST['name']} <{$_POST['from']}>\r\n",
    ];

    if (wp_mail($to, $subject, $message, $headers)) :
        echo json_encode(['status' => 'success']);
    else :
        echo json_encode(['status' => 'error']);
    endif;

    wp_die();
}

add_action('wp_ajax_sendMessageForAdmin', 'ars_send_message_for_admin');
add_action('wp_ajax_nopriv_sendMessageForAdmin', 'ars_send_message_for_admin');