dio kontakt forme koji treba raditi tj radi

<form id="kontakt_forma" action="mail.php" method="post">
                            <p>Unesite e-mail adresu</p>
                            <input type="email" id="email" placeholder="Vaša e-mail adresa" size="50" required>
                            <p>Vaša poruka</p>
                            <textarea name="poruka" id="poruka" rows="8" cols="40"></textarea>
                            <div class="g-recaptcha" data-sitekey="MY_SITE_KEY"></div>
                            <input type="submit" name="submit" id="posalji" value="Pošalji poruku">
                        </form>