It is always fun to see people trying to insult Microsoft, but you are forgetting that the largest part of compromised hosts which are actually doing damage are hosts running software like PHPBB, Wordpress and a variety of other 'common web software for everybody', who then don't update and a simple google by a virus will reveal their locations. As these things tend to run on webservers in a datacenter and not on a puny cable/dsl line, they do a lot more damage then the hosts running software from the company you are trying and failing to insult. No. The Internet is IPV4 based, if you are going to live in IPv6-only land you are being silly as there is almost nothing there. Ask you provider about that, as that should not be an issue. Seeing that postfix still has buggy delivery code, yes. (Postfix will try every single address provided and give up after a few of them, while it should be trying AAAA for lowest MX, A for lowest MX, AAAA for 2nd MX, A for 2nd MX etc.) Do realize also that some people actually earn money with this thing called the Internet, thus even 0.01% loss of clients might mean several million lost in revenue. Not even thinking about the helpdesk/support charges to debug a broken IPv6 setup, possibly not on their side, but on the remote site or heck in the middle. There is somewhere a thread here about contacting your ISP and it is something that people have been doing for a long long time already. Still think about the money and you'll understand that provide will keep out of some steps for the time being.