* Rafael Azevedo <raf...@gmail.com>:
> Wietse,
> 
> I use this settings:
> 
> FROM: "raf...@zoom4u.com.br"
> SENDER: "reto...@iagentemail.com.br"
> REPLY TO = FROM

Well, postfix doesn't log that. Postfix is only logging the envelope
sender ("SENDER" in your case)
 
> So the email is sent as reto...@iagentemail.com.br but using FROM
> raf...@zoom4u.com.br because we want to receive every email bounce on
> "reto...@iagentemail.com.br".

Yes, that's ok

> We only change the FROM and REPLY to addresse, but when using ZOOM4U
> as "FROM" it really slows down connection speed.

Please try disabling DKIM :)

-- 
Ralf Hildebrandt
  Geschäftsbereich IT | Abteilung Netzwerk
  Charité - Universitätsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12203 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebra...@charite.de | http://www.charite.de
            

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