Enhancing E-Mail Security With Procmail

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Unsolicited testimonials I have received in my email:

Date: Sun, 1 Feb 2004 21:14:37 -0500
From: iMars Networks Hostmaster 
To: John D. Hardin 
Subject: Re: NovArg rule may need adjustment

{discussion of support issue omitted}

Thank you VERY much for your quick response!

Your Sanitizer has saved me a ton of problems in the past and obviously
continues to do so now with NovArg. I couldn't believe how quickly you came
up with the rule on the evening before it got media attention. We have just
over a hundred mail accounts protected by it and, if it weren't for my
slip-up with the local rules, over the past two years no account would ever
have reported a virus sneaking through. Combined with SpamAssassin and a
handful of blacklists, I can provide virtually spam-free and virus-free
accounts without any costs. (Especially with my daily auto-update script for
filenames and rules.) It helps bring Internet E-Mail back up to how useful it
was ten years ago.

Stephane Lavergne
iMars Networks, Host Manager
EMail: hostmaster@iMars.net
WWW: http://www.iMars.net/

Date: Tue, 21 May 2002 17:03:43 -0400
From: Kent Wagoner 
To: jhardin@impsec.org
Subject: Compliments on the E-Mail Sanitizer

Mr. Hardin,

I just wanted to send you a short note thanking you for your e-mail 
sanitizer system.  It has, without a doubt, saved my company (and my 
sanity) many times over.

Since installing it on my company's central mailserver, I have trapped 
and disposed of every single inbound e-mail virus that has come our way. 

We have a zero-percent infection rate for systems that get their mail 
from my mailserver.  In fact, some of my users have grown so confident 
in the mailserver's ability to stop viruses and worms that they've 
talked about removing the anti-virus software installed on their 
workstations (an idea I have strongly discouraged.)

My thanks for an incredible application.  You've made this SysAdmin's 
life much, much easier.

Kent J. Wagoner
System Administrator
Osprey Technologies / ViewCast Corporation

Date: Wed, 07 Feb 2001 08:29:06 -0800
From: ******
To: *****
Cc: jhardin@wolfenet.com
Subject: Helpful E-mail for getting rid of Hybris and other net based  virii - system admins

Here's the deal:

I'm a network admin with a few mail servers running Sendmail 8.11.
E-mail security has ALWAYS been the highest priority on our security
checklist for invasion techniques.

Today we were battling with the Hybris worm, behind the scenes...

Point blank, we've stopped the following dead, even before the news
services caught on to the onslaught:

Melissa (all variants)
I Love You
New Apt
Explore Zip
All VBS, SCR, CHM, PIF delivered virii
And more...

All I can say is: Jason[sic] Hardin's Procmail script

This script has saved myself, and our company well into the
ten-thousands of dollars of downtime, productivity, and overall
potential destruction by these viruses.  It's easy to use, and anyone
with a UNIX mail server and procmail should implement this (either
sitewide or per user).


n.b.: my name is John...

I can be contacted at <jhardin@impsec.org> - you could also visit my home page.

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