ILikeRed's Journal: Choke points for spam

A large problem with spam is the collection of zombie systems (mostly Microsoft home computers) on residential broadband lines that act as relays for spam. Most of these users have simple firewalls supplied by their broadband providers that they never really configure that provide DNS proxy services, among other services. Is it not about time to start pressuring these ISPs to upgrade these firewalls to also block port 25 outgoing by default and proxy outgoing SMTP to the ISP's mail servers? For advanced users who modify their firewall settings anyway, it would only be one extra setting to configure, but it would provide an extra hurdle in the form of a choke point for spam for anyone wishing to run a zombie of spam relays off unsuspecting user's computers.