preinst is in courier-mta 0.78.0-2ubuntu2.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | #!/bin/sh
set -e
if [ "$1" = "install" ]; then
dpkg-divert --package courier-mta --add --rename \
--divert /usr/bin/addcr.ucspi-tcp /usr/bin/addcr
dpkg-divert --package courier-mta --add --rename \
--divert /usr/share/man/man1/addcr.ucspi-tcp.1.gz /usr/share/man/man1/addcr.1.gz
fi
exit 0
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