How to fail freemail not coming from freemail domain's SMTP?

[francis picabia]

Hi,

Here is an example of the problem:

X-Spam-Status: No, score=3.14 tagged_above=0 required=6.2
	tests=[DKIM_ADSP_CUSTOM_MED=0.001, FREEMAIL_FROM=0.001,
	HTML_MESSAGE=0.001, NML_ADSP_CUSTOM_MED=1.2, RDNS_NONE=1.274,
	SPF_NEUTRAL=0.652, T_KHOP_FOREIGN_CLICK=0.01, UNPARSEABLE_RELAY=0.001]
	autolearn=disabled

Received: from noreplyhere.25u.com (unknown [184.22.52.149])	by
 capella.mydomain.ca (Postfix) with ESMTP id 1D02519CC77	for
 <firstname.last at mydomain.ca>; Mon, 14 Nov 2011 20:23:55 -0400 (AST)
Received: from ([127.0.0.1]) with MailEnable ESMTP; Mon, 14 Nov 2011 19:23:50
 -0500
From: Mike Baker <aaa.imprimerie at gmail.com>


I'd like to score something negative against a situation where the
from address shows an address from hotmail, gmail, yahoo, and yet the
SMTP server talking to us isn't one of the SMTP servers belonging to
the freemail domain.

There were no DKIM signature in the headers.
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