On Tue, Apr 27, 2010 at 4:31 PM, <[email protected]> wrote: > Hi, > > I have a client, he receives a lot of spam from his ISP Mailserver. > Is there a way to limit spam using an OpenBSD Gateway with PF and Spamd at > his place ? (His mailserver is ISP Mailserver, so he hasn't mailserver) > > I think it is not possible, true ? > If you have an idea ...
I have a totally different perspective and answer due to my experience fighting spam. In fact I get close to 40 GB downloads for my open source spam product based on spamd. It does a great job of spam control or else why would people download? ;) Even in my customer locations in Chennai where they run my appliance they get only 5 spam messages in a year. But you should understand that the incidence of spam in India is much lower than America. Anyway read up this page: http://spam-cheetah.com/install.html to understand what you can achieve with pf(4) and spamd for spam control and how you ensure that the TCP rdr is completed in the reverse direction also. You need to configure the mail server's gateway as spamd. This is only necessary when you run spamd and do rdr(a reverse of NAT) . Whereas if you act as a TCP proxy in which you setup a connection to the mail server from the spamd machine using nc or some similar thing(you could configure using inetd(8)) then your mail server can be anywhere. I have never tried that config and I can bet that rdr is way more efficient... Sorry I can't do more justice to this topic as I am running out of time. Later. Ever yours, Girish -- Gayatri Hitech web: http://gayatri-hitech.com SpamCheetah Spam filter: http://spam-cheetah.com
