.... SMTP & DNS should be run through the servers provided by the ISP for the exact purpose. There is no valid reason for a dialup customer to ^^^^^ OH YES THERE IS !!!! (at least to a different resolver other than yours)
go direct to root-servers.net and there is no reason why a dialup user should be sending mail directly to AOL, or any mail server for that matter (besides their host ISP)
-Matt
Except for the fact the your DNS server may be using a root cache file that points to the restrictive USG root network that is currently controlled by a a corrupt monopoly. What about customers who want to use ORSC or Pacificroot? There are about 11,000 TLDs out there and you want to limit your customers to have to suffer under the current totalitarian dictatorship? I wouldn't ever be a customer of your's.