if(isset($_POST)) { send(); }
    
} catch (Exception $e) {
    echo "Message could not be sent. Mailer Error: {$mail->ErrorInfo}";
    die();
}

<div class="form-block">
                        <form method="post" data-bs-toggle="validator" class="shake">
                            <div class="row">
                                <div class="form-group col-sm-6">
                                    <input type="text" name="mail_form_adi" placeholder="Adınız ve Soyadınız" size="30" />
                                </div>
                                <div class="form-group col-sm-6">
                                    <input type="text" name="mail_form_konu" placeholder="Konu" size="30" />
                                </div>
                            </div>
                            <div class="row">
                                <div class="form-group col-sm-6">
                                    <input type="text" name="mail_form_tel" placeholder="Telefon Numaranızı Giriniz" size="30" />
                                </div>
                                <div class="form-group col-sm-6">
                                    <input type="text" name="mail_form_eposta" placeholder="E-Posta Adresiniz" size="30" />
                                </div>
                            </div>
                            <div class="row">
                                <div class="form-group">
                                    <textarea name="mail_form_mesaj" rows="5" placeholder="Mesajınızı giriniz" required></textarea>
                                </div>
                            </div>
                            <button type="submit" name="submit" class="btn lnk btn-main bg-btn6">Gönder <span class="circle"></span></button>
                    
                                <p class="trm"><i class="fas fa-lock"></i>Spam mail koruma aktif.</p>
                                <div id="msgSubmit" class="h3 text-center hidden"></div>
                                <div class="clearfix"></div>
                        </form>
                    <?php } ?>