/usr/share/sendmail/examples/db/aliases is in sendmail-base 8.15.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Mail aliases for sendmail
#
# You must run newaliases(1) after making changes to this file.
#
# Required aliases
postmaster: root
MAILER-DAEMON: postmaster
# Common aliases
abuse: postmaster
spam: postmaster
# Other aliases
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