[Mimedefang] New spammer trick?

[Kenneth Porter]

--On Tuesday, November 25, 2003 3:44 PM -0500 "David F. Skoll" 
<dfs at roaringpenguin.com> wrote:

> sub filter_relay {
>     my($hostip, $hostname, $helo) = @_;
>     if ($helo =~ /roaringpenguin\.com$/i) {
> 	return('REJECT', "Go away... $hostip is not a roaringpenguin.com
> machine");     }
> }
>
> NOTE:  This machine is only used for INBOUND mail coming from EXTERNAL
> sources.  There is *never* a valid reason for a roaringpenguin.com to try
> to relay through it.

Is the interface accessible at this point, so that one can skip this rule 
on mail from the internal interface?