On 19/04/06, James Clark
jdmwoolley(a)ihug.co.nz wrote:
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.
Wrong.
There *are* worms out there which will use the outbound SMTP server, but the majority I have seen come direct to MX. Default port 25 blocking by some of the large ISPs would have cut down a lot of stuff coming in at my last gig. Besides, a lot of people are using various of the dynamic-space blocking lists these days, so you will likely have significant trouble sending mail from a bog-standard ADSL line these days. -- Jamie Riden / jamesr(a)europe.com / jamie.riden(a)computer.org "Microsoft: Bringing the world to your desktop - and your desktop to the world." -- Peter Gutmann