to know smtp traffic

["Joan Soler \(CODINE\)" <joan@xxxxxxxxx>]

Hello, I'm trying to know the size of my traffic in smtp port (25), I write:

 

iptables -A INPUT -p tcp --dport 25 -j traf_in

 

But it doesn't works, anyone knows what can I do. I use Suse 8.0.

 

Thanks a lot!!!.

Joan S.