autoreply postfix

[Paul Schmehl]

--On March 10, 2006 2:22:06 PM -0300 Rodrigo Mufalani 
<rodrigo.pinto at mxm.com.br> 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: testing at stovebolt.com
250 Ok
RCPT TO: bogus at utdallas.edu
554 <bogus at utdallas.edu>: 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 (pauls at utdallas.edu)
Adjunct Information Security Officer
The University of Texas at Dallas
http://www.utdallas.edu/ir/security/