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From: Wietse Venema (wietseporcupine.org)
Date: Sun Mar 15 2009 - 12:38:24 CDT
> OpenDNS will not blindly redirect DNS queries that look like DNSBL
> requests. Notice the difference:
> % dig resolver1.opendns.com www.abcdefghijklmnop12345.com +short
> % dig resolver1.opendns.com 220.127.116.11.www.abcdefghijklmnop12345.com
Note, this still breaks lookups of rfc-ignorant.org and other sites
that blacklist domain names instead of IP addresses.
If you must run an MX host, use a real DNS server.