Reverse DNS Question

Larry Sheldon LarrySheldon at
Tue Apr 20 15:37:54 CDT 2010

On 4/20/2010 15:26, Antonio Querubin wrote:
> On Tue, 20 Apr 2010, James Martin wrote:
>> What is the purpose for this besides resolving name-based reverse lookups?
>> Are there any definitive guides out there on how this works (besides the
>> ARIN site)?
> It's for resolving address-based lookups.  When ARIN allocates address 
> space to you, you now become responsible for the reverse-lookups for that 
> allocated address range.

Some email blacklist operators have draconian requirements for PTR
values for IP addresses that (attempt to) send email.

To minimize unwarranted hassle, if you will have email senders, spend
some time looking into the "requirements".  I don't think there are any
RFC or other authoritative standards in the matter.
Somebody should have said:
A democracy is two wolves and a lamb voting on what to have for dinner.

Freedom under a constitutional republic is a well armed lamb contesting
the vote.

Requiescas in pace o email
Ex turpi causa non oritur actio
Eppure si rinfresca

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