Multiple A and PTR and the "main" ones?
JLightner at dsservices.com
Fri Sep 11 14:33:22 UTC 2015
Actually some mail servers DO check not only that a PTR exists but also that it is not "generic".
Every once in a while we get someone complaining because one of the big sites (Ebay?) refuses to accept their email due the "generic" (as defined by that site's policies) nature of our PTR. We typically ignore that because we've never seen this complaint from other mail servers and no one has ever provided a business use for the one site that is complaining.
Other than that I've never seen any complaint about what the actual PTR is so I can't imagine why you'd need more than one for the same IP. Just pick the one that helps identify you for anyone that cares to look at IPs vs names.
From: bind-users-bounces at lists.isc.org [mailto:bind-users-bounces at lists.isc.org] On Behalf Of Reindl Harald
Sent: Friday, September 11, 2015 8:50 AM
To: bind-users at lists.isc.org
Subject: Re: Multiple A and PTR and the "main" ones?
Am 11.09.2015 um 14:42 schrieb Marek Kozlowski:
> On 09/11/2015 02:36 PM, Reindl Harald wrote:
>> STAY ON LIST - the last time i had enough of repeating that a answer
>> on a public ML is not a invitation for private support i got
> Oups! Sorry! :-( Sorry! Sorry!
> I'm sending this with the whole "history" of our conversation.
>> it is my opinion backed by dealing with DNS and email for many years
>> facing all problems left and right we never had because the strict
>> policy here that one IP has only one PTR
>> what "official bad practice" do you need when you can see the
>> problems otherwise would not be possible at your own?
> In the sense: "`best current practice' says something opposite".
> BTW: Are we talking on multiple PTRs for mail servers only or multiple
> PTRs in general?
well, in fact mailservers because for other services PTR's are not that important or verified at all - if they are not verified why bother about it?
but what would you gain by having multiple PTR records at all for whatever server? that's in fact the only relevant question
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