Apache2 - 403 Forbidden when posting a certain string

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http://serverfault.com – I have an html form like so: form accept-charset="utf-8" enctype="multipart/form-data" name="edit_orders" action="custom-quotes-request.php?action=edit&id=<?php echo $_GET['id']; ?>&type=update" method="post" There's two form fields which send customer email address. Part of the POST data is encoded as: c_email=&email_cus= Those two are just plain text fields. Whenever the email contains the string "rolex" I get a 403 Forbidden error. I've set file permissions and checked server configuration. I'm using a dedicated server and the support crew are quite knowledgeable on (HowTos)