Re: Blocking MX query

[Suresh Ramasubramanian <ops.lists () gmail com>]

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