Mail Form in a modal box

Hello..

I’ve builded a WordPress theme based on bootstrap 3.x

I’ve mail form in modal box. When I click submit button, it returns 404 error page.

What the reason can be?

Thanks.

<?php get_header(); ?>
<script src='https://www.google.com/recaptcha/api.js'></script>
<?php
$hasError = '';
$succMsg = '';

if(!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
    $ip_address = $_SERVER['HTTP_X_FORWARDED_FOR'];
} else {
    $ip_address = $_SERVER['REMOTE_ADDR'];
}

if(isset($_POST['submit']) && !empty($_POST['submit'])):

	if(isset($_POST['g-recaptcha-response']) && !empty($_POST['g-recaptcha-response'])):

		$secret = '';
		$verifyResponse = file_get_contents('https://www.google.com/recaptcha/api/siteverify?secret='.$secret.'&response='.$_POST['g-recaptcha-response']);
		$responseData = json_decode($verifyResponse);

		if (!empty($_POST['adsoyad'])) {
			$name = stripslashes(trim($_POST['adsoyad']));
		} else {
			$hasError = "Lütfen ad?n?z? giriniz.";
		}

		if (!empty($_POST['email'])) {
			$email = stripslashes(trim($_POST['email']));
		} else if ( ! eregi( "^[A-Z0-9._%-]+@[A-Z0-9._%-]+\.[A-Z]{2,4}$", trim($_POST['email'] ) ) ) {
			$hasError = 'Ge?ersiz e-posta adresi girdiniz.';
		} else {
			$hasError = "Lütfen e-posta adresinizi giriniz.";
		}

		$egitim = $_POST['egitim'];

		if($responseData->success):

			$to = '';
			$subject = '';
			$htmlContent = "
				<h1>Form ??eri?i</h1>
				<p><b>Ad Soyad: </b>".$name."</p>
				<p><b>E-posta Adresi: </b>".$email."</p>
				<p><b>E?itim: </b>".$egitim."</p><br/><br/>
				<p><b>IP Adresi: </b>".$ip_address."</p>
			";
			$headers = "MIME-Version: 1.0" . "\r\n";
			$headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";
			$headers .= 'From:'.$name.' <'.$email.'>' . "\r\n";

			@mail($to,$subject,$htmlContent,$headers);

			$succMsg = "?leti?ime ge?ti?iniz i?in te?ekkür ederiz. ?lgili departman en k?sa sürede sizinle irtibata ge?ecektir.";
			$name = '';
			$sname = '';
			$email = '';
			$message = '';

		else :

			$hasError = "Bir hata olu?tu, lütfen tekrar deneyiniz.";

		endif;

	else :

		$hasError = "Bir hata olu?tu, lütfen tekrar deneyiniz.";

	endif;
else :

	$hasError = '';
	$succMsg = '';
	$name = '';
	$sname = '';
	$email = '';
	$message = '';	

endif;
?>

<!-- Modal -->
<div class="modal fade" id="basvuru" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
	<div class="modal-dialog" role="document">
		<div class="modal-content">
			<div class="modal-header">
				<button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
				<h4 class="modal-title" id="myModalLabel">E??T?ME BA?VUR</h4>
			</div>
			<div class="modal-body">
				<form class="contactForm" id="egitimform" name="egitimform" method="post" action="<?php the_permalink(); ?>">
					<div class="form-group">
						<label for="adsoyad" class="col-sm-3 control-label">Ad Soyad</label>
						<div class="col-sm-9">
							<input type="text" class="form-control" name="adsoyad" id="adsoyad" placeholder="Ad Soyad">
						</div>
					</div>
					<div class="form-group">
						<label for="email" class="col-sm-3 control-label">E-Posta Adresi</label>
						<div class="col-sm-9">
							<input type="email" class="form-control" name="email" id="email" placeholder="E-Posta Adresiniz">
						</div>
					</div>
					<div class="form-group">
						<div class="col-sm-9 col-sm-offset-3">
							<div class="g-recaptcha" data-sitekey="6LdyxB4TAAAAAAK6gf4m5OnUVcKpL8PMJCg5EtwG"></div>
						</div>
					</div>
					<input type="hidden" name="egitim" value="<?php the_title(); ?>">
					<input type="submit" name="submit" class="button" id="egitimsubmit" value="G?NDER">
				</form>
			</div>
		</div>
	</div>
</div>