my router = Cisco 2651XM with wic-adsl card.
IOS = c2600-adventerprisek9-mz.124-2.T.bin
I've set up a mail server computer at my home and I was wondering if there are any known good router firewall settings that will hinder spammers relaying junk mail through my mail server. I know there are several things I can do on the server machine itself, but I'd also like to stop them at the router if that's possible.
I know I can filter traffic based on outside IP address but people's ip addresses change all the time so that's not a viable approach. Is it possible to filter outside traffic based on an outside mac address?
Thanks for any advice.