Jeff Huang a écrit :
> Hi,
>  
> 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.
>  
> It means that the bounce mail has no from,

which is exactly what the SMTP standard says.

> and some mailServer reject these email.
>  

This is exactly what the "dsn" section of rfc-ignorant.org is about.
sites that reject the null sender are out of smtp...

that said, this doesn't mean you can send backscatter. please take a
look at the BACKSCATTER README. (also google for "backscatter").


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

Don't even try. the null sender address was selected to avoid inifite
loops (error on error).

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