Re: [nznog] Port 25

disabling their customer's service.

Actually, subscribers have the option to "opt-out" so if you know what you're doing and WANT to use another smtp server/use port 25 for some reason you still can. A reasonable compromise between, "disabling their customer's service" and being proactive about security in my personal opinion. Not that blocking port 25 is going to be a magic bullet against all viruses/worms etc, but a start anyway.