/usr/share/doc/procmail/examples/forward is in procmail 3.22-25+deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | "|IFS=' ' && p=/usr/local/bin/procmail && test -f $p && exec $p -Yf- || exit 75 #YOUR_LOGIN_NAME"
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