What are some best practices for creating a user-friendly interface for subscribing to Majordomo lists using PHP?

Issue: When creating a user-friendly interface for subscribing to Majordomo lists using PHP, it is important to provide clear instructions and a simple form for users to enter their email address and subscribe easily. 

<form action="subscribe.php" method="post">
    <label for="email">Enter your email address:</label>
    <input type="email" id="email" name="email" required>
    <input type="submit" value="Subscribe">
</form>
```

In the `subscribe.php` file, you can handle the form submission and add the user's email to the Majordomo list:

```php
<?php
if(isset($_POST['email'])) {
    $email = $_POST['email'];
    
    // Add the user's email to the Majordomo list
    // Your code to subscribe the user
    
    echo "You have successfully subscribed to the Majordomo list!";
} else {
    echo "Please enter a valid email address.";
}
?>

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