Here is a quick form and processing script to automate subscriptions to and from your ezmlm mailing lists:
  1. Put this form into a page on your website: 
    
<form action = "subscribe.php" method = "post">
<p>
Your Email Address: <input type = "text" name = "email">
</p>

<p>
Action:<br>
<select name = "action">
<option value = "subscribe">Subscribe
<option value = "unsubscribe">Unsubscribe
</select>
</p>

<input type = "submit" value = "send">
</form>
  2. Next, create a file called subscribe.php and put the following inside that file: 
    
<?

$list_name = "news";
$domain = "your_domain.com";

if ($action == "subscribe") {
  $email = str_replace("@", "=", $email);
   $address = $list_name . "-subscribe-" . $email . "@" . $domain;
   mail($address, "subscribe", "", "From: $email\nReply-To: $email\n");
}

if ($action == "unsubscribe") {
  $email = str_replace("@", "=", $email);
   $address = $list_name . "-unsubscribe-" . $email . "@" . $domain;
   mail($address, "subscribe", "", "From: $email\n");
}

?>

<head>
</head>
<body>

A confirmation message has been sent to the address you specified. You will
need to reply to this message in order to complete this action.

</body>
</html>
The only things you need to change are:

$listname = "news"

Change this to the name of your list

$domain = "your_domain.com";

Change this to your actual domain name

Upload the subscribe.php page to the same directory as the file that has your subscribe form. Visitors to your site will now be able to subscribe and unsubscribe from your website.