$name = trim(filter_input(INPUT_POST, 'name', FILTER_SANITIZE_STRING));
$email = trim(filter_input(INPUT_POST, 'email', FILTER_SANITIZE_EMAIL));

<form method="post" enctype="multipart/form-data">

<p>
    E-Mail:
</p>
<p>
    <input type="text" name="receiver" title="receiver1"/>
</p>

<p>
    Subject:
</p>
<p>
    <input type="text" name="subject" title="subj1"/>
</p>

<p>
    Note:
</p>
<p>
    <textarea name="message" title="message"></textarea>
</p>

<p>
    Select Photo:
    <input type="file" name="file"/>
</p>

<input type="submit" name="submit" value="Send Email"/>

</form>

<?php
require '../vendor/autoload.php';

if (isset($_POST['submit'])) {

    $mail = new PHPMailerPHPMailerPHPMailer();

    try {

        $sender = "?????????@gmail.com";
        $mail->isSMTP();
        $mail->Host = 'smtp.gmail.com';
        $mail->SMTPAuth = true;
        $mail->Username = "$sender";
        $mail->Password = '?????????????';
        $mail->SMTPSecure = 'tls';
        $mail->Port = '587';

        $mail->isHTML();

        $mail->setFrom($sender, 'Mailer');
        $mail->addAddress($_POST["receiver"]);
//        $mail->addAttachment ($file_name);
        $mail->isHTML(true);

        $mail->Subject = $_POST["subject"];
        $mail->Body = $_POST["message"];

        $mail->send();
        echo 'Message has been sent';
    } catch (Exception $e) {
        echo 'Message could not be sent. Mailer Error: ', $mail-
>ErrorInfo;
    }

}

?>