DNS based subdomain system.

[Junior]

Hi

Im llooking for a DNS based subdomain script .. My users shd be able to change DNS settings (A, CNAME, MX) records for their subdomains.. Plus they shd get email for theier subdomain like user@subdomain.domain.com

Im prepared to pay, but I've searched around the net for such a script, cudnt find! Can guyz here help me find one script?