$to = $email;
$subject = "Заявка с сайта xxx";
$message = 'Текст письма';
$headers = "Content-type: text/html; charset=utf-8 \r\n";
$headers .= "From: xxx<no-reply@xxx.ru>\r\n";
$headers .= "Reply-To: info@xxx.ru\r\n";
mail($to, $subject, $message, $headers);