nanog mailing list archives
Re: Blocking MX query
From: Mark Andrews <marka () isc org>
Date: Wed, 05 Sep 2012 12:00:33 +1000
In message <CAArzuost70Yq=KfXHXZSOV+ptg6apiDzm71=FhCS+Ty_yo5OAA () mail gmail com>, Suresh Ramasubramanian writes:
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
Well he was looking for software to block the queries. There is a whole mentality that homes don't need X which on closer examination just doesn't bear up to scrutany. This includes blocking SMTP or don't you think home users are entitled to have privacy when it comes to whom they email? STARTTLS from anywhere to anywhere is possible today and is not vulnerable to interception except in the MX's themselves. You can secure the MX records (and their absense) and secure the CERTs used by STARTTLS.
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
-- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka () isc org
Current thread:
- Re: Blocking MX query, (continued)
- Re: Blocking MX query Suresh Ramasubramanian (Sep 04)
- Re: Blocking MX query Bacon Zombie (Sep 04)
- Re: Blocking MX query Ibrahim (Sep 04)
- Re: Blocking MX query Suresh Ramasubramanian (Sep 04)
- Re: Blocking MX query Ibrahim (Sep 04)
- Re: Blocking MX query Tony Finch (Sep 04)
- Re: Blocking MX query William Herrin (Sep 04)
- Re: Blocking MX query Rich Kulawiec (Sep 04)
- Re: Blocking MX query Jimmy Hess (Sep 04)
- Re: Blocking MX query Mark Andrews (Sep 04)
- Re: Blocking MX query Suresh Ramasubramanian (Sep 04)
- Re: Blocking MX query Mark Andrews (Sep 04)
- Re: Blocking MX query Suresh Ramasubramanian (Sep 04)
- Re: Blocking MX query Jimmy Hess (Sep 04)
- Re: Blocking MX query Mark Andrews (Sep 04)
- Re: Blocking MX query Rich Kulawiec (Sep 04)
- Re: Blocking MX query Ray Wong (Sep 04)
- Re: Blocking MX query Suresh Ramasubramanian (Sep 04)
- Re: Blocking MX query Jay Ashworth (Sep 04)
- Re: Blocking MX query Suresh Ramasubramanian (Sep 04)
- Re: Blocking MX query Masataka Ohta (Sep 04)
- Re: Blocking MX query Suresh Ramasubramanian (Sep 04)