sendmail.php

<?php

    $headers = array();
    $headers[] = 'From: ' .$_POST['ncf_name_field'] . ' <' . str_replace(array("\r", "\n", "\n", "\t", ",", ";"), '', $_POST['ncf_email_field']). ">\r\n";

   $result = mail(
        '[email protected]',
        "Nnja Form Submission",
        'Name: ' .  $_POST['ncf_name_field']  . "\n" .
          (isset($_POST['ncf_company_field']) && !empty($_POST['ncf_company_field']) ? ('Company: ' . $_POST['ncf_company_field'] . "\n") : '') .
          (isset($_POST['ncf_phone_field']) && !empty($_POST['ncf_phone_field']) ? ('Phone: ' . $_POST['ncf_phone_field'] . "\n") : '') .
          (isset($_POST['ncf_address_field']) && !empty($_POST['ncf_address_field']) ? ('Address: ' . $_POST['ncf_address_field'] . "\n") : '') .
        'Email: ' .  $_POST['ncf_email_field']  . "\n" .
          "\n\n----------------Message-----------------\n\n" .
        $_POST['ncf_message_field'] ,
       ‘From: Admin <[email protected]>\r\n”
    );

    if($result) {
        echo json_encode(array('success' => true, 'result' => $result));
           die();
    }

    echo json_encode(array('success' => false, 'message' => __("Message not sent. An unknown error occurred.", 'ninja-contact-form' ), 'result' => $result));
    die();
?>