Date: Mon, 6 Mar 2006 09:39:46 -0300 From: "Cesar" <listas@itm.net.br> To: <freebsd-hackers@freebsd.org> Subject: Spam from NAT boxes Message-ID: <009601c6411b$0d455d90$0e4fdfc8@ironman>
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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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