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's IPv6 address.

The address is 2001:1838:2001:8::20, with reverse delegated to and but those hostnames don't
resolve. The auth servers for return SERVFAIL.


It's being looked at now. I'll updated once it's fixed.

Our provider has fixed their reverse zones delegation at ARIN. It's working, but will need ~24 hours for the cached ttl to expire.