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Re: [DNSOP] Review of draft-livingood-dns-redirect-00

Jim Reid <jim@rfc1035.com> Fri, 17 July 2009 10:21 UTC

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From: Jim Reid <jim@rfc1035.com>
To: "Livingood, Jason" <Jason_Livingood@cable.comcast.com>
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Date: Fri, 17 Jul 2009 11:22:26 +0100
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Cc: Andreas Gustafsson <gson@araneus.fi>, dnsop@ietf.org
Subject: Re: [DNSOP] Review of draft-livingood-dns-redirect-00
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On 16 Jul 2009, at 13:32, Livingood, Jason wrote:

> Please do send me that list of applications.  I would very much like  
> to
> describe these use cases in the next version of the draft.

Yet another example. Many mail servers (including mine) reject SMTP  
connections from hosts that don't have reverse DNS. That's usually a  
strong indicator of a likely spam source. If some DNS redirector  
changes those NXDOMAIN/NOHOST responses to something else, those mail  
servers will accept inbound mail from places they wanted to reject.

Many anonymous FTP servers behave(d)this way too, at least in the pre- 
web era. IIRC, some of the most useful/popular FTP servers did this to  
encourage people to fix their reverse DNS setup.

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