Barry Margolin <bar...@alum.mit.edu> wrote:

> This suggests one of the following problems:
> 
> 1. 95.102.17.107 is pointing to your nameserver in its resolver 
> configuration, but your server doesn't allow them to use you as a 
> resolver (the IP isn't in your allow-recursion and allow-query-cache 
> ACL).
> 
> 2. The plus.com zone is delegated to your server, but you're not 
> properly configured to serve it.

3. Incorrect behaviour by the resolver behind 95.102.17.107.

I admin an authoritative nameserver which hosts domains with MX records
outside the zones: commercial spam/virus-filtering companies providing
the MXs for their mail customers which are our DNS-hosting customers.
I regularly see queries for the MX records of the hosted domains being
immediately followed by queries for the A records for their out-of-zone
MX servers.  I infer confusion within the resolvers about which
nameservers to query.

-- 
Ronan Flood <use...@umbral.org.uk>
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