postinst is in postfix-policyd-spf-perl 2.010-1.
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 15 16 | #!/bin/sh
set -e
if [ "$1" = "configure" ]; then
if ! id -u policyd-spf >/dev/null 2>&1; then
adduser --quiet --system --group --no-create-home policyd-spf
elif [ -n "$2" ]; then
addgroup --quiet --system policyd-spf
usermod -g policyd-spf policyd-spf
fi
fi
exit 0
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