 koitsuPremium,MVM
join:2002-07-16
Mountain View, CA
kudos:14 | reply to just4info
Re: [Spam] Comcast reporting spam from my IP said by just4info:If you have other PCs running on your network, you may want to check if there is anything running on those that may send bulk emails directly without going through your freebsd box. A friend of mine received the same email and found out he had some unwanted program hijacked one of his PCs to send mails. I'm not suggesting your PC is having virus. But I guess that is what comcast support would ask you to check anyway. Such isn't the case. I have outbound ACLs applied on my gateway (router), which do not permit any outbound packets to TCP ports 25, 110, 465, 587, and 993. The ACL allows a *single IP address* on my LAN -- the above FreeBSD box running postfix -- to send outbound packets to any of those ports.
Meaning: let's say I have a wireless network and someone somehow compromises it, gaining access to my local network, and that person uses a computer that sends out spam or has viruses of some kind. There's absolutely no way this would work due to the ACL. If they configured their mail client to use my local FreeBSD box as their SMTP server, that would work -- however, I'd have evidence of it in my SMTP logs, which I do not.
To my knowledge, there are no viruses or malware applications that can affect FreeBSD, and the machine is definitely not compromised (I rebuilt world/kernel literally last night). |
