4 Sep
2012
4 Sep
'12
9:48 p.m.
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