/usr/bin/spfmilter is in spf-milter-python 0.8.18-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 | #! /bin/sh
exec /usr/bin/spfmilter.py &
echo $! >/var/run/spf-milter-python/spfmilter.pid
|