/etc/courier/aliases/system is in courier-mta 0.68.2-1ubuntu3.
This file is owned by daemon:daemon, with mode 0o640.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | # Copyright 1998 - 1999 Double Precision, Inc. See COPYING for
# distribution information.
#
# Mail alias definition.
#
# Courier does not deliver to root, therefore forward root mail to postmaster
root: postmaster
# Also send mailer-daemon's mail to postmaster
mailer-daemon: postmaster
MAILER-DAEMON: postmaster
uucp: postmaster
# You must specify a non-privileged account to receive postmaster mail.
# The postmaster CANNOT be root. Until you specify a valid postmaster
# alias below, all postmaster mail will be bitbucketed.
postmaster:
# Additional aliases may be defined here, or create other files in
# local/config/aliases directory.
#
# After making any changes, run the makealiases script to compile the
# alias database.
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