Jean-Luc CHANDEZON:
> Hello,
> I believe my request is very simple, but I don't find how I can do that.
> When you receive a NDR from postfix server, the mail is sent by
> MAILER-DAEMON@hostname.local.
> I would to change the sender. I've seen you can modify master.cf, by adding
> "null_sender=" values in a pipe, but it does not work.
The null_sender option works as documented. It sets the ENVELOPE
SENDER ADDRESS not the FROM header.
Setting the FROM header of (non-)delivery notifications is unsafe,
as it may cause mail error messages to go into a loop.
Wietse
