using 2 ip addresses
 

hello

i have a small lan network and a router which have a 2 ip addresses

everything is set up to use one ip address so no proble until now

but a mont ago for som rason the isp blocked all outgoind trafic to 25 port (there is a long story, a fight between 2 isp's) so thei gived me a second ip address where a 25 port works fine, so i setupt a ifconfig to eth0:1 to use second ip

now the question, how to set up a iptables or should i use an another tool to do that the all outgoint trafic to 25 port would be sent from the second ip adress eth0:1 ?

thanks, and sorry for realy bad english