Great Circle Associates List-Managers
(May 1997)
 

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Subject: check_mail ruleset for sendmail.cf
From: "Bill Casti, CQA (System Administrator)" <help @ quality . org>
Date: Tue, 13 May 1997 08:12:03 -0400 (EDT)
To: List-Managers @ GreatCircle . COM

Greetings:

This addition to your sendmail.cf file will automatically reject any 
incoming mail to your system that comes from a domain that can't be 
resolved. As you already know, most spams come from forged domains. 
This'll catch 'em and toss 'em before you see 'em.

Add this to your sendmail.cf file, right before the box reading "REWRITING
RULES". Be sure to "tab" where there are currently spaces and to un-wrap
any lines that "wrap" in transfer, since sendmail will choke on on spaces
and on wrapped lines.

I have it installed on my systems, and I know of at least one ISP that is
using it. It works great and has cut down the dreck substantially.

Regards.
Bill

---------- Forwarded message ----------


############################################
###  ANTI SPAM / FORGE Ruleset           ###
############################################

Scheck_mail

# check for valid domain name (incompatible with DeliveryMode=defer)
R$*			$: <?> $>3 $1				make domain canonical
R<?> $* < @ $+ . >	$: <OK>					tag resolved names
R<?> $* < @ $+ >	$#error $: 451 Domain must resolve	Error
ROK			$@ OK					Okay
R$+			$: $1					Okay



------------------- End Forwarded Message --------------------

=============================================================================
 Bill Casti, CQA                                     Email: help @
 quality .
 org
 - Domain Owner, QUALITY.ORG                         Pager: +1 800 604 6149
 - List Moderator, "TQM in Manufacturing and Service Industries"
 - Chairman, Electronic Media
    ASQC Section 0511 (Northern VA)     Section Email: E-media @
 quality .
 org
 - 1997-98 Chair-elect, Executive Board, ASQC Section 0511 
 - Senior Administrator, Internet Systems, Fed. Emergency Mgmt. Agency (FEMA)
-----------------------------------------------------------------------------
          Get Your New CyberQ Teeshirt now! See the Design at
               http://www.quality.org/html/teeshirts.html
=============================================================================




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