Customize postfix's answers

9 msg	queue behavior
3 msg	X-Original-To inconsistency
5 msg	SMTP Transaction logs?
2 msg	backup mail server problems
4 msg	Change error messages
3 msg	transport_maps is ignored
8 msg	mails from servers with no PTR

Customize postfix's answers
\ David Brachet (20 Jul 2007)
. \ Ralf Hildebrandt (20 Jul 2007)
. . \ David Brachet (20 Jul 2007)
. . . \ Ralf Hildebrandt (20 Jul 2007)

6 msg	send mail to multiple users
2 msg	transpot decision based on cyrus mailbox existence
2 msg	force a bounce on a message in the queue
5 msg	What causes: 421 Error: timeout exceeded (in re...
3 msg	Prevent specific user to authenticate in SASL/L...
2 msg	Prevent specific user to authenticate in SASL/LDAP
12 msg	Looking for a fail-over strategy for a mail server
7 msg	postfix/smtpd can works in tls wrapper mode,cou...
2 msg	Connection timed out - Issue
4 msg	postfix and field 'Date' in message headers
4 msg	bounce notification of relayhost
5 msg	Postfix + SASL Problem

Hi all,

When Postfix rejects a mail, it can send an answer automatically to the
sender. Can we customize this answer? And where? Thanks