lp php email

<?php
            header('Content-Type: text/html; charset=utf-8');

            if(isset($_POST['email']) || isset($_POST['optin_email'])) {


                // EDIT THE 2 LINES BELOW AS REQUIRED


                $email_to = "Reciever Email";
                        $email_from = 'Sender Email';

                $email_subject = "Subject";


                $first_name     = $_POST['name']    ? $_POST['name']    : $_POST['optin_name']; // required
                $email          = $_POST['email']   ? $_POST['email']   : $_POST['optin_email']; // required
                $phone          = $_POST['phone']   ? $_POST['phone']   : $_POST['optin_phone'];
                $subject        = 'Subject'; // required

                $email_message  = "Subject.\n\n";


                function clean_string($string) {
                    $bad = array("content-type","bcc:","to:","cc:","href");
                    return str_replace($bad,"",$string);
                }


                $email_message .= "Name: ".clean_string($first_name)."\n";
                $email_message .= "Email Address: ".clean_string($email)."\n";
                $email_message .= "Subject: ".clean_string($subject)."\n";
                $email_message .= "Phone: ".clean_string($phone)."\n";


                // create email headers

                $headers = 'From: '.$email_from."\r\n".

                'Reply-To: '.$email."\r\n" .

                'X-Mailer: PHP/' . phpversion();

                @mail($email_to, $email_subject, $email_message, $headers);

                ?>