<div class="col-md-4 col-sm-12">
                    <div class="contact-form bottom">
                        <h2>WYŚLIJ WIADOMOŚĆ</h2>
                        <form id="main-contact-form" name="contact-form" method="post" action="sendemail.php">
                            <div class="form-group">
                                <input type="text" name="name" class="form-control" required="required" placeholder="Twoje imie">
                            </div>
                            <div class="form-group">
                                <input type="email" name="email" class="form-control" required="required" placeholder="Twój e-mail">
                            </div>
                            <div class="form-group">
                                <textarea name="message" id="message" required="required" class="form-control" rows="8" placeholder="Wpisz wiadomość..."></textarea>
                            </div>                        
                            <div class="form-group">
                                <input type="submit" name="submit" class="btn btn-submit" value="WYŚLIJ">
                            </div>
                        </form>
                    </div>
                </div>

<?php
$name       = @trim(stripslashes($_POST['name']));
$from       = @trim(stripslashes($_POST['email']));
$subject    = @trim(stripslashes($_POST['subject']));
$message    = @trim(stripslashes($_POST['message']));
$to           = 'MÓJ@EMAIL.COM';//replace with your email

$headers   = array();
$headers[] = "MIME-Version: 1.0";
$headers[] = "Content-type: text/plain; charset=iso-8859-1";
$headers[] = "From: {$name} <{$from}>";
$headers[] = "Reply-To: <{$from}>";
$headers[] = "Subject: {$subject}";
$headers[] = "X-Mailer: PHP/".phpversion();

mail($to, $subject, $message, $headers);

die;