Since you already have validation, i can only suppose that someone is visiting your action.php page.It is enough to visit the action.php page, to recieve a blank email. You can avoid this either using a session, that will prevent the email submission if no session value is found by the script, or add a validation (in the php script) that will look at all fields, and if all of them are blank, it will not submit.

Add this code as first line of your php script, immediately after <?PHP

if ($_POST == ""){
header ("Location: pagetogoto.html");
exit;
}


replacing pagetogoto.html with the actual page name (can be an error page or simply the index page)

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