[dns-operations] Trustworthiness of PTR record targets

[Doug Barton]

The OP specifically said "anti-spam providers" in the context of "is 
there a risk that the target domain could be blacklisted by anti-spam 
providers?"

I am assuming that everyone here (including the OP) knows that specific 
anti-spam solutions that you would run on your mail servers look for 
valid PTRs, but that would seem to be a different thing entirely from 
what the OP seems to be asking about.

... so I revert to my original point, which is that it's hard to answer 
the OP's question intelligently without knowing more about what he's 
asking.

Doug


On 03/04/2014 10:06 AM, WBrown at e1b.org wrote:
> Doug wrote on 03/04/2014 12:48:03 PM:
>
>> 2. In my experience (which is not thorough, but also not zero) anti-spam
>
>> folks are completely uninterested in what's in the PTR, and generally do
>
>> not do any blacklisting by domain name in the sense you seem to mean.
>
> Not exactly true.  Many insist that there is a valid PTR record.  Some
> care that it has a valid name, and that the forward lookup for that name
> matches.
>
> RBLs however, only look at IP address.
>
>
>
> Confidentiality Notice:
> This electronic message and any attachments may contain confidential or
> privileged information, and is intended only for the individual or entity
> identified above as the addressee. If you are not the addressee (or the
> employee or agent responsible to deliver it to the addressee), or if this
> message has been addressed to you in error, you are hereby notified that
> you may not copy, forward, disclose or use any part of this message or any
> attachments. Please notify the sender immediately by return e-mail or
> telephone and delete this message from your system.
>