I've recently started moving to ISPConfig 3 from another hosting control panel. My DNS servers are not only physically separate but are running Bind. I will need to keep them as such, as they handle a lost more than just hosting for us. I would love for customers to be able to handle DNS via ISPConfig, but I'm not sure how that would work out. Currently the hosting machine has my two main DNS servers as it's DNS servers, however I'm not sure of the best way to handle things from there as ISPConfig wont be able (or will it?) to update the Bind servers. One thought I've had is simply telling hosting customers on that machine to use ISPConfig's DNS server rather than my two main DNS server, although I'd really like to keep things together.