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/usr/share/sendmail/examples/db/userdb is in sendmail-base 8.15.2-3.

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#User names and the inbound(maildrop)/outbound(mailname) addresses
#dest machine/domain names must also be in sendmail.cG for masquerading
# NOTE: do NOT use FEATURE(stickyhost) with userdb
# NOTE: be carefull with local delivery, defeats plussed users
#
# NOTE: Combined with virtusertable and/or aliases, Genericstable
#       can do everything the userdb can and more (and the difference
#       is growing bigger). The userdb is basically obsolete.
#:default:mailname		badlands.org
#cowboy:mailname			cowboy@vnet.ibm.com