What's rDNS for the ip address(es) assigned to you?
I don't know about him, but, on my ADSL connection, it is controlled by my nameservers: ;; ANSWER SECTION: 10.159.192.in-addr.arpa. 86400 IN NS ns.rop.edu. 10.159.192.in-addr.arpa. 86400 IN NS ns.delong.sj.ca.us.
I'm not highly in favor of blocking traffic from broadband users and killing the end-to-end principle that makes the Internet work,
I'm not in favor of mindless blocking of entire netblocks that may contain stuff that should not be blocked, but broadband providers are notorious for (e.g.) lumping residential customers that can be blocked, with no collateral damage, in the same netblocks as business customers who need to run Internet facing servers, and (e.g.) not providing an easy way to differentiate between the two classes of customer in the first place.
Who are you to decide that there is no damage to blocking residential customers? I'm a residential customer, but, I have a number of servers running, and, a port 25 block would be very destructive to the operation of my mailserver. Why should an ISP decide what a residential customer can or can't do with their internet connection. (This is not an advocation for abandoning TOS or allowing abuse. I am talking about within the confines of legitimate internet use, such as hosting a web site (or even several), running nameservers, mail server(s), etc.) Owen -- If this message was not signed with gpg key 0FE2AA3D, it's probably a forgery.