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Date: Wed, 19 Nov 1997 13:06:26 -0700 (MST)
From: Charles Mott <cmott@srv.net>
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To: chat@freebsd.org
Subject: Re: Mail spam, sigh...
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On Wed, 19 Nov 1997, Sean Eric Fagan wrote:
> For the most part, the sendmail rules I sent out a while back are good
> enough, don't require a fixed IP address, and don't require you to get an AS
> number (which is the case if you go th egated route).  Quoth Paul, "wouldn't
> you rather just use DNS?"

Thanks to you and J. Bresler for explaining this.  I just checked the DNS
method for a few known spam addresses and it works amazingly well. 

I would have to agree that Vixie would not want to have hundreds of
distinct home autonomous systems talking BGP with his router.  Even if
Paul wouldn't let me connect, I still am intrigued with having my own AS
number.  It would analogous being in a Cessna 172 waiting for takeoff
clearance with all these huge jets around you.

  -- Charles Mott


> 
> Once again, the sendmail rules are (for the m4 file):
> 
> LOCAL_CONFIG
> FR-o /etc/sendmail.cR
> 
> LOCAL_RULESETS
> Scheck_rcpt
> # anything terminating locally is ok
> R< $+ @ $=w >		$@ OK
> R< $+ @ $=M >		$@ OK
> R$+ @ $=w		$@ OK
> R$+ @ $* $=M		$@ OK
> 
> # Anything originating locally is ok
> R$*			$: $(dequote "" $&{client_name} $)
> R$=w			$@ OK
> R$=M			$@ OK
> R$@			$@ OK
> 
> # Anything else is bogus
> R$*			$#error $: "550 Relaying Denied"
> 
> Scheck_mail
> R$*			$: $(dequote "" $&{client_addr} $)
> R$-.$-.$-.$-		$(host $4.$3.$2.$1.rbl.maps.vix.com. $:OK $)
> ROK			$@ OK
> R$+			$#error $: 5.1.3 $@ "Mail from " $(dequote "" $&{client_addr} $) " refused, see http://maps.vix.com/cgi-bin/lookup?" $&{client_addr}
>