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From D Hill <>
Subject Re: google netblocks records etc
Date Tue, 03 Jun 2008 13:08:07 GMT
On Tue, 3 Jun 2008 at 15:42 +0300, confabulated:

> On Tue, Jun 03, 2008 at 02:02:29PM +0200, Benny Pedersen wrote:
>> i know this fact, but OP question only based on reverse :/
> One should always assume "reverse" means _confirmed_ reverse. I don't know
> why anyone would assume otherwise by default. :) Especially if we are
> talking about serious software like postfix etc.

In Postfix:

     Reject the request when the client IP address has no address->name

     Reject the request when 1) the client IP address->name mapping fails,
     2) the name->address mapping fails, or 3) the name->address mapping
     does not match the client IP address.

reject_unknown_client_hostname would be what you are calling confirmed 
reverse. If I were to use that, support would start getting phone calls 
and customers would start getting upset.

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