Re: Filtering spam from dialup accounts
- Date: Wed, 13 May 1998 18:40:08 +0300 (EET DST)
On Wed, 13 May 1998, Scott A. Marlin wrote:
> 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.
Try using a Linux server with ipfwadm as a filter for all
your outgoing traffic. You can tell ipfwadm to filter all
out-going packets on port 25.
Ipfwadm is available from
ftp://ftp.xos.nl/pub/linux/ipfwadm/ipfwadm-1.2.tar.gz
see for reference http://www.xos.nl.
Best Regards,
Sebastian
__________________________________________________________
Home: (+40)/1/3.141.863 | snail: Sebastian Taralunga
Mob: (+40)/92/202.086 | C.P. 13-20,
Fax: (+40)/1/3.365.761 | Bucharest, Romania
E-mail: seba@localhost, WWW: http://tcx.kappa.ro
