/usr/share/sendmail/examples/dhcp/dhclient-exit-hooks.d/sendmail.md5sum is in sendmail-base 8.15.2-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1
2adc5e32474fb128ee6c7b4425d06a58 sendmail