> On Apr 25, 2017, at 1:35 PM, Luis Miguel Flores dos Santos 
> <miguel_flores_san...@hotmail.com> wrote:
> 
> Victor can I use  "Postfix After-Queue Content Filter" to insert new header 
> based in a query ?

Wrong question.  You should not have to do this at all.  Why do you have
a proxy that cannot do mail routing between Postfix and the downstream MTAs?

The right solution is deliver directly from Postfix to the intended destination.

> Today I have 10 mail server and I have created a proxy for the domain to 
> coexist between them. And create a postfix to clients connect and send 
> message (Previous mail)

What is the purpose of the proxy.  Given that your English is poor, a longer 
description of the requirements will likely make more sense than a short one 
which will lose a lot in translation.

-- 
        Viktor.

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