* Jeff Huang <jbhu...@scut.edu.cn>:

> I found that the Return-Path is null when postfix send bounce mail.It like 
> this:
> 
> Return-Path: <>
> 
> And it show that from=<> from mailllog.

Yes, that's how it must be done. See the relevant RFCs

> It means that the bounce mail has no from,and some mailServer reject these 
> email.

Some people are idiots. What's new?

> How can I to set a sender address to bounce mail? 

What happens if the bounce bounces?

-- 
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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