mail.nanog.org broken v6 reverse DNS

While wondering at high spam scores for NANOG mail, I noticed that it's in part because of broken reverse DNS for mail.nanog.org's IPv6 address. The address is 2001:1838:2001:8::20, with reverse delegated to ns1.scservers.com and ns2.scservers.com... but those hostnames don't resolve. The auth servers for scservers.com return SERVFAIL. -- Chris Adams <cma@cmadams.net>