pfqueue(8) on Linux
The text 06ecce4f2d38, as Debian 4.0 (Etch) shipped it.
A queue realtime scanner for MTA
Flags it lists
-
-B -
-b -
-c -
-d -
-e -
-h -
-l -
-m -
-n -
-p -
-q -
-r -
-s -
-v