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Re: smtpd_recipient_restrictions suddenly stopping mail
From: Wietse Venema (wietse
porcupine.org)
Date: Sun Mar 15 2009 - 12:38:24 CDT
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Sahil Tandon:
> OpenDNS will not blindly redirect DNS queries that look like DNSBL
> requests. Notice the difference:
>
> % dig resolver1.opendns.com www.abcdefghijklmnop12345.com +short
> 208.69.32.132
> % dig resolver1.opendns.com 40.30.20.10.www.abcdefghijklmnop12345.com
> +short
> %
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.
Wietse
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