Log Message:
Add qtraceaddr, a Perl script that illustrates how qmail decides how to
deliver messages for any addresses given on the command line. If your
qmail installation used non-default values for conf-qmail, conf-break,
or the alias user, you can specify them in the $QMAIL, $QMAILBREAK, and
$QMAILALIAS environment variables. For example:

    # env QMAILBREAK=+ qtraceaddr address@example.org