postqueue(1) on macOS
The text 881827a32d96, as macOS 10.12.6, macOS 10.12.5, macOS 10.12.4, macOS 10.12.3, macOS 10.12.2, macOS 10.12.1, macOS 10.12 shipped it.
Postfix queue control
Flags it lists
-
-c -
-f -
-i -
-j -
-p -
-s -
-v