Um.. Don.. so you're saying that because you've implemented a policy that rejects email based on the contents of the PTR, that this is Telecom's fault and they need to 'fix' it? Which 'we' are you referring to and what 'discussion' was there? Since when does NZNOG get to create an operational consensus of that nature and then blindly assume that everyone will implement it? Broadcasting the issue on NZNOG would seem to be inappropriate; this isn't a fault, this is collateral damage of a policy decision you've chosen to make. I doubt that nzvanlines.co.nz would be the only sender affected, but the impact would seem to be on your customer. You've made the decision to do this; live with the consequences or change your approach. The IP of the nzvanlines.co.nz MX record has a valid matching forward/reverse pair - which is the basic reputational check many MTA's perform - the fact it contains suggestions that it might be from a residential-grade connection is not something _I_ would choose to use when attempting to filter spam; (been there; onceuponatime SORBS attempted to run a blacklist that identified dynamic IP address ranges. Persistent false positives meant that this was eventually a lost cause.) There are plenty of ways to reduce your spam-count, this wouldn't seem to be a smart one; In this case NZ Van Lines would need to decide if making wholesale changes to the way they deliver email to the world is worthwhile based on their inability exchange mail with your platform, and your customer needs to decide if the disruption to their email service is worth the cost of the measure that's been put in place. And you need to decide whether it's worth the time and energy and potential loss of customers, should they decide to move to a service provider who can effectively filter spam without blocking legitimate email for what seems to be a fairly inappropriate reason. Mark. On 10/09/13 22:17, Don Gould wrote:

From:mailto:gillian.halkett(a)nzvanlines.co.nz> SIZE=50696 Tue 2013-09-10 15:27:37: [126020:1] <-- 250 2.1.0 Ok Tue 2013-09-10 15:27:37: [126020:1] --> RCPT To:mailto:jenna(a)christchurchapartments.co.nz> Tue 2013-09-10 15:27:38: [126020:1] <-- 553 5.7.1 <222-154-247-46.adsl.xtra.co.nz http://adsl.xtra.co.nz[222.154.247.46]>: Client host rejected: AUTO_[A|X]DSL We aren't accept direct connection not from dedicated SMTP servers. Please use your internet provider SMTP Server. Tue 2013-09-10 15:27:38: [126020:1] --> QUIT

We're rejecting mail from nzvanlines.co.nz because they're running their smtp server on a service with a|x|vdsl in the ptr record.

I think we've had this discussion on list before, and iirc we decided that we just get providers to update ptr records, but I'm a bit scared to ring L1HD and ask for a ptr change.

Is there an admin on list from Telecom who can work with your customer to fix this for as I doubt it's only us it's impacting?

D -- Don Gould 31 Acheson Ave Mairehau Christchurch, New Zealand Ph: + 64 3 348 7235 Mobile: + 64 21 114 0699 Ph: +61 3 9111 1821 (Melb)

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