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Operating Systems Linux Sendmail bounce to postmaster Post 302762581 by DGPickett on Monday 28th of January 2013 05:13:17 PM
Old 01-28-2013
I think the default used to do that, but hackers could exploit it to test for mailboxes. So, this setup should be only on intranet hosts, not Internet exposed ones. The rewrite rule sets in sendmail.cf are not for the weak of heart. Overview of Configuration Files Riley wrote one of their thickest books on it. Many competing mail servers with gui configuration have sprung up to compete with the default. I found a reverse tip, something maybe you can undo: Sendmail rewrites email address to send to the local machine instead? - Server Fault
Added define(LUSER_RELAY',local:root')dnl to return undeliverable mail to unknown users to root instead of to sender, per serverfault.com/questions/274211/sendmail-dsn-user-unknownsapark Oct 6 '11 at 18:51
 

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ERROR(8)						      System Manager's Manual							  ERROR(8)

NAME
error - Postfix error mailer SYNOPSIS
error [generic Postfix daemon options] DESCRIPTION
The Postfix error mailer processes message delivery requests from the queue manager. Each request specifies a queue file, a sender address, a domain or host name that is treated as the reason for non-delivery, and recipient information. This program expects to be run from the master(8) process manager. The error mailer client forces all recipients to bounce, using the domain or host information as the reason for non-delivery, updates the queue file and marks recipients as finished, or it informs the queue manager that delivery should be tried again at a later time. Delivery problem reports are sent to the bounce(8) or defer(8) daemon as appropriate. SECURITY
The error mailer is not security-sensitive. It does not talk to the network, and can be run chrooted at fixed low privilege. STANDARDS
None. DIAGNOSTICS
Problems and transactions are logged to syslogd(8). Depending on the setting of the notify_classes parameter, the postmaster is notified of bounces and of other trouble. BUGS
CONFIGURATION PARAMETERS
The following main.cf parameters are especially relevant to this program. See the Postfix main.cf file for syntax details and for default values. Use the postfix reload command after a configuration change. Miscellaneous bounce_notice_recipient Postmaster for bounce error notices. notify_classes When this parameter includes the bounce class, send mail to the postmaster with with the headers of the bounced mail. SEE ALSO
bounce(8) non-delivery status reports master(8) process manager qmgr(8) queue manager syslogd(8) system logging LICENSE
The Secure Mailer license must be distributed with this software. AUTHOR(S) Wietse Venema IBM T.J. Watson Research P.O. Box 704 Yorktown Heights, NY 10598, USA ERROR(8)
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