Re: Filtering spam from dialup accounts

["Scott A. Marlin" <]

laitinen@localhost wrote:
> 
> Hi!
> 
> Good that you're taking action ;-)
> 
> First of all, if the spammer uses your smtp server (or not), you should turn
> your mail relay function off, ie. you shouldn't relay mail that just passes
> your system and doesn't originate from your domain and isn't addressed to your
> domain. Otherwise anybody could abuse your system, and it is only a matter of
> time that somebody does it.
> 

I think you have misunderstood the problem. Our mail servers are using
anti-spam techniques like those you describe.

In this precise case, the "customer" is logging into a diap-up (modem)
account and is using his *own* mail server to spam from his home or
office. What I am looking for are filtering techniques like "no SMTP
packets can leave InterNeXT if they are from a certain range of IP
addresses" - I was thinking of a solution on a BGP level.

Another way of solving the problem would be for *all* other SMTP servers
to reject mail coming from unresolved hosts. That would help get the
reverse ARPA up to date. I may just start responding to spam complaints
in this manner :-)

> Then you might want to consider legal action against this spammer, if possible.

This will certainly be considered if we get our hands on him. It is too
easy to get a POP account these days : no proof of identity is needed in
France.

In any case, thank you for your time.
-- 
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  Scott A. Marlin                   |       "Les petits faisceaux
  Support Technique                 |     font les grandes lumihres."
  
	    
	    
       |                      - Fulcanelli