[156043] in North American Network Operators' Group
Re: Blocking MX query
daemon@ATHENA.MIT.EDU (Suresh Ramasubramanian)
Tue Sep 4 21:49:10 2012
In-Reply-To: <20120905010829.7599D2479BC1@drugs.dv.isc.org>
Date: Wed, 5 Sep 2012 07:18:37 +0530
From: Suresh Ramasubramanian <ops.lists@gmail.com>
To: Mark Andrews <marka@isc.org>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Wed, Sep 5, 2012 at 6:38 AM, Mark Andrews <marka@isc.org> wrote:
>
> MUA's can make MX queries to validate entered addresses
> before SMTP/SUBMISSION is even attempted.
>
Sure but not on this guy's network as he's transparently proxying dns
and blocking MX requests on his proxy
Of course a bot can build up a rich cache of MX records from elsewhere
and send from a botted 3g modem connected host on his network
