On 4/5/2012 12:52 AM, Nataraj wrote:
> On 04/04/2012 08:48 PM, Bob Hoffman wrote:
>> No idea where else to ask this and get a real qualified answer but here.
>> Not exactly pure centos question....but...
>>
>> I am adding blacklists to my postfix smtpd settings.
>> I have the inkling that after the first lookup for a domain or ip that
>> my dns caches the result and I no longer bother the RBL or RHSBL list
>> owners anymore in that instance.
>>
>> Is that correct? I hate to waste their resources if it is not.
>>
>> thanks,
>> bob
>>
>>
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>> http://lists.centos.org/mailman/listinfo/centos
> Not exactly. It is whatever TTL they return, though generally short for
> two reasons, they and you probably want it so that they can quickly
> remove entries from the blacklist once issues have been resolved.
>
> They want to know how often you query the blacklist, because they want
> to charge a fee if you are a large site with high volume queries. I
> guess they need to fund their service somehow.
>
>
> Nataraj
>
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> http://lists.centos.org/mailman/listinfo/centos
>
>
yea, I am already sending donations..well worth it.
they 100,000 or more queries and then you can have access to the lists
to download..though that ranges from 250 to 1000 a year, for each
one....yikes.
Still, well worth it if you have the cash and have a lot of users.
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