[120346] in North American Network Operators' Group
Re: DNS question, null MX records
daemon@ATHENA.MIT.EDU (Douglas Otis)
Wed Dec 16 20:21:05 2009
Date: Wed, 16 Dec 2009 17:20:16 -0800
From: Douglas Otis <dotis@mail-abuse.org>
To: nanog@nanog.org
In-Reply-To: <g36386ctof.fsf@nsa.vix.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 12/16/09 4:48 PM, Paul Vixie wrote:
> Douglas Otis<dotis@mail-abuse.org> writes:
>
>> If MX TEST-NET became common, legitimate email handlers unable to
>> validate messages prior to acceptance might find their server
>> resource constrained when bouncing a large amount of spam as well.
>
> none of this will block spam. spammers do not follow RFC 974 today
> (since i see a lot of them come to my A RR rather than an MX RR, or
> in the wrong order). any well known pattern that says "don't try
> to deliver e-mail here" will only be honoured by friend people who
> don't want us to get e-mail we don't want to get.
Agreed. But it will impact providers generating a large amount of bounce
traffic, and some portion of spam sources that often start at lower
priority MX records in an attempt to find backup servers without valid
recipient information. In either case, this will not cause extraneous
traffic to hit roots or ARPA.
-Doug
