[nsd-users] Hi! Im trying to set forward and reverse on an internal ip with nsd/unbound.

[nsd-users at starka.st]

On 2025-08-06 05:47, Jamie Landeg-Jones wrote:
> tmberg via nsd-users <nsd-users at lists.nlnetlabs.nl> wrote:
> 
>>>> I want it to look like:
>>>>
>>>> Received: from [tMbERG_tMbERG_.224.starka.st] (tMbERG_tMbERG_.224.starka.st [tMbERG_tMbERG_.224.starka.st])
>>>>           by mx.starka.st (mx.starka.st) with ESMTP id C46691BA5C
>>>>           for <test-pu6fpd2ay at srv1.mail-tester.com>; Thu, 31 Jul 2025 17:48:33 +0200 (CEST)
>>>>
>>>> When sending mail. ( for example )
>>>>
>>>> Instead of:
>>>>
>>>> Received: from [192.168.0.224] (tMbERG_tMbERG_.224.starka.st [192.168.0.224])
>>>>           by mx.starka.st (mx.starka.st) with ESMTP id C46691BA5C
>>>>           for <test-pu6fpd2ay at srv1.mail-tester.com>; Thu, 31 Jul 2025 17:48:33 +0200 (CEST)
>>>>
>>>> But can it be done?
> 
>> Sorry. I forgot to mention that Postfix/Unbound/Nsd is running on the
>> same box.
>>
>> Since its the same box I was thinking. Its all originating from the same
>> system. It could be "fun". And because I can. ( Well... )
>>
>> Setting it like that.
>>
>> Thats it!
> 
> The standard "from" part of the header is either:
> 
> Received: from HELO-STRING (HOSTNAME [IP-ADDRESS]) by ....
> 
> or:
> 
> Received: from HELO-STRING (IP-ADDRESS) by ....
> 
> So, it seems like your reverse DNS is fine, but your mail client isn't
> sending the correct "HELO" string.
> 
> Also, you can't avoid the IP address appearing unless you reconfigure
> postfix itself to behave in a  non-standard way:
> 
> https://serverfault.com/questions/952009/how-to-modify-receive-header-in-postfix
> 
> https://www.pobox.help/hc/en-us/articles/1500000193602-The-elements-of-a-Received-header
> 
> So, you just need to fix your mail client!
> 
> P.S. "HELO" string can also be "EHLO" string, and is basically the client greeting.
> 
> Cheers, Jamie

Thank you very much!

/T

-- 
T