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From: Wietse Venema (wietseporcupine.org)
Date: Thu Sep 10 2009 - 05:39:56 CDT
> What does postfix actually add to the bounce message?
> The STDERR output if the return status is not 0?
Postfix absorbs stdout and stderr. There is some information in
the pipe(8) man page, but it is not complete.
Command exit status codes are expected to follow the conventions
defined in <sysexits.h>. Exit status 0 means normal successful comple-
Postfix version 2.3 and later support RFC 3463-style enhanced status
codes. If a command terminates with a non-zero exit status, and the
command output begins with an enhanced status code, this status code
takes precedence over the non-zero exit status.
Problems and transactions are logged to syslogd(8). Corrupted message
files are marked so that the queue manager can move them to the corrupt
queue for further inspection.