Spam from NAT boxes

[Baldur Gislason]

With the fwd rule, you can only redirect to 127.0.0.1 when you want your machine to
intercept the connection.
I'd suggest putting a tcp proxy or smtp proxy listening on 127.0.0.1 port 25
that just forwards to the mailserver box.

Baldur

On Mon, Mar 06, 2006 at 09:39:46AM -0300, Cesar wrote:
> Hi,
> 
>   I have some NAT boxes running FreeBSD, each of these boxes do NAT for 
> like 100+ people.
>   Almost everyday my IPs got blacklisted because of spam. I cant block the 
> smtp traffic going out became some people need it to send true e-mails.
>   Are there any tool to detect/block those spams?
> 
>   I tought in a program that receive the connection diverted/forwarded by 
> ipfw and then deliver it to SpamAssassin ...
> 
>   I also have an e-mail server fully configurated with anti-spam, 
> anti-virus ... I tried forward to this e-mail server all my NAT box tcp 
> connections to port 25.
> 
>   ipfw add fwd xx.xx.xx.xx,25 tcp from 192.168.0.0/24 to any 25
> 
>   I got some matches in this rule when I try to send an email, but I didnt 
> get redirected to my email server.
> 
> 
>   Any ideas and/or sugestions?
> 
> 
> Thanks 
> 
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