exim and procmail, and how to stop spammers?

[ferret@phonewave.net]

I'd like to make exim use procmail to deliver incoming messages by
default, using the ~/.procmailrc file. I haven't been able to make much
headway through the documentation, however. I know sendmail will do this
by default, but sendmail seems to be (with default configurations) more
open to use by spammers. (I just got a spam from localhost relayed TO me
aparantly from the spammer's ISP) and I haven't made much headway with
sendmail, even with having ORA's sendmail book.

This is what I got out of my syslog.
--->
Dec  2 19:12:28 playdough sendmail[29527]: TAA29527:
from=<656783hst@localhost>, size=1252, class=0, pri=31252, nrcpts=1,
msgid=<gksntriishbvqhfolad.wteerlsgd@4kudos2all.com>, proto=SMTP,
relay=ip210.albany5.ga.pub-ip.psi.net [38.30.3.210]

Dec  2 19:12:28 playdough sendmail[29530]: TAA29527:
to=<admin@ferret.phonewave.net>, delay=00:00:09, xdelay=00:00:00,
mailer=local, stat=Sent
<---
And here's the message headers
--->

Received: from 4kudos2all.com (ip210.albany5.ga.pub-ip.psi.net
[38.30.3.210])
        by playdough.mentasm.org (8.9.3/8.9.3/Debian/GNU) with SMTP id
TAA29527
        for <admin@ferret.phonewave.net>; Thu, 2 Dec 1999 19:12:19 -0800
Subject: Real Time CC Processing...$39.95/mo!!!!
From: 656783hst@ferret.phonewave.net
Content-Type: text/plain;
        charset="iso-8859-1"
Content-Transfer-Encoding: 7BIT
Message-Id: <gksntriishbvqhfolad.wteerlsgd@4kudos2all.com>
To: admin@ferret.phonewave.net
Date: Thu, 02 Dec 1999 21:54:07 -0500
<---


Could someone help me get my MTA (whichever one) working more to what I'm
wanting?

-- Ferret no baka