bley(1) on Linux
The text 6f931755b5e0, as Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it.
intelligent greylisting daemon for Postfix
Flags it lists
-
--config -
--debug -
--help -
--pidfile -
--verbose -
--version -
-c -
-d -
-h -
-p -
-v