Allow external domains to use my nameserver without using BIND

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http://serverfault.com – Is it possible to allow users to point their domains to my nameservers from their domain provider, e.g. GoDaddy, 123-reg, etc. For example, they enter my nameservers: ns1.domain.com, ns2.domain.com into the set nameservers panel. But when I go to my new domain that hasn't been configured with BIND on my server, Firefox says that the server cannot be found. When I do a DNS lookup, the domains have my nameservers and the IP of the nameservers, but doesn't take me to my server. I already have a domain which is configured with BIND, but I want to allow other domains that are not mine to be able (HowTos)