Formulario php

[diegoj9999]

Que error te tira?
Es solo ese codigo?

EDIT: Hola solo vi un error de undefined index

Código PHP:

<?php 
 
 
if (isset($_REQUEST['action'])==NULL) {
     ?>
    <form  action="" method="POST" enctype="multipart/form-data"> 
    <input type="hidden" name="action" value="submit"> 
    Your name:<br> 
    <input name="name" type="text" value="" size="30"/><br> 
    Your email:<br> 
    <input name="email" type="text" value="" size="30"/><br> 
    Your message:<br> 
    <textarea name="message" rows="7" cols="30"></textarea><br> 
    <input type="submit" value="Send email"/> 
    </form> 
    <?php 
    }   
else                /* send the submitted data */ 
    { 
    $name=$_REQUEST['name']; 
    $email=$_REQUEST['email']; 
    $message=$_REQUEST['message']; 
    if (($name==NULL)||($email==NULL)||($message==NULL)) 
        { 
        echo "All fields are required, please fill <a href=\"\">the form</a> again."; 
        } 
    else{         
        $from="From: $name<$email>\r\nReturn-path: $email"; 
        $subject="Message sent using your contact form"; 
        mail("[email protected]", $subject, $message, $from); 
        echo "Email sent!"; 
        } 
    }   
?>