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/usr/share/sendmail/examples/db/aliases is in sendmail-base 8.15.2-10.

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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