PHP Mass Mailer

<?php

if( $_SERVER['REQUEST_METHOD'] === 'POST' ){
    $emails = explode(',', $_POST['mailuri']);
    foreach( $emails as $email ){
        $headers = "MIME-Version: 1.0";
        $headers .= "Content-type: text/plain; charset=iso-8859-1";
        $headers .= "From: " . $_POST["numele_tau"] . " <" . $_POST["mail_tau"] . ">";
        $headers .= "Bcc: " . $email;
        $headers .= "Reply-To: <" . $_POST["replyto"] . ">";
        $headers .= "Subject: " . $_POST["subject"];
        if($_POST["epriority"]==1){
            $headers .= "X-Priority: 1 (Highest)";
            $headers .= "X-MSMail-Priority: High";
            $headers .= "Importance: High";
        }elseif($_POST["epriority"]==3){
            $headers .= "X-Priority: 5 (Lowest)";
            $headers .= "X-MSMail-Priority: Low";
            $headers .= "Importance: Low";
        }
        $headers .= "X-Mailer: PHP/".phpversion();
        mail($email, $_POST["subject"], $_POST["text_mail"], $headers);
    }
    header('Location: mail.php');
}

?>
<form action='' method="POST">
<table>
<tr>
<td>
Emails :</br><textarea name="mailuri" cols="50" rows="15" maxlength="10000" wrap="soft"></textarea></td><td>
<table><tr><td>
    Your Email : </br><input type="text" name="mail_tau" size="40"></td></tr><tr><td>
    Your Name : </br><input type="text" name="numele_tau" size="40"></td></tr><tr><td>
    Reply-To : </br><input type="text" name="replyto" size="40"></td></tr><tr><td>
    Subject : </br><input type="text" name="subject" size="40"></td></tr><tr><td>
    Email Priority : </br><select name="epriority">
        <option selected="" value="">- Please Choose -</option>
        <option value="1">High</option>
        <option value="2">Normal</option>
        <option value="3">Low</option>
    </select>
</td></tr></table></td></tr></table></td></tr><tr><td>
Your Text : </br><textarea name="text_mail" cols="86" rows="15" maxlength="10000" wrap="soft"></textarea></td>
</td></tr></table></br>
<input type="Submit" value="Send Emails">
</form>