So, if I understand you, I can't redirect mail packets (smtp and pop3) in the same subnet with iptables rules??
Could you tell me another method to do this?? This firewall is going to be in a honeynet and the purpose of it is to capture the ougoing mail packets, wich a test malware at the honeypots will try to send, and redirect it to an analysis machine.
Thank you for your help!!
I'm thinking about placing the knoppix system in a DMZ with an Orange card.
Any smtp or pop3 related packet generated in the green card (the honeynet) subnet will be redirected to the knoppix system in the orange card, wich will reply the messages to the sender. The honeywall will redirect the reply to an analysis system in the green card.