--On March 10, 2006 2:22:06 PM -0300 Rodrigo Mufalani <[EMAIL PROTECTED]> wrote:

Hi all,

  I want configure postfix autoreply, for undelivery mails

If one user does not exists.

Every MTA already does this, *if* you mean reject the mail:

telnet smtp.utdallas.edu 25
Trying 129.110.10.12...
Connected to smtp.utdallas.edu.
Escape character is '^]'.
220 smtp1.utdallas.edu ESMTP Postfix
EHLO stovebolt.com
250-smtp1.utdallas.edu
250-PIPELINING
250-SIZE 157286400
250-VRFY
250-ETRN
250 8BITMIME
MAIL FROM: [EMAIL PROTECTED]
250 Ok
RCPT TO: [EMAIL PROTECTED]
554 <[EMAIL PROTECTED]>: Recipient address rejected: Access denied
QUIT
221 Bye
Connection closed by foreign host.

If you mean, send an autoreply to the sender, as others have pointed out, you do *NOT* want to do that. If you do, your server will get blacklisted very quickly.

Paul Schmehl ([EMAIL PROTECTED])
Adjunct Information Security Officer
The University of Texas at Dallas
http://www.utdallas.edu/ir/security/

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