mailpost(8) on Linux
The text ca147af44c8a, as Debian 11 (Bullseye) shipped it.
Feed an e-mail message into a newsgroup
Flags it lists
-
-a -
-b -
-c -
-d -
-f -
-h -
-m -
-n -
-o -
-p -
-r -
-t -
-x -
-z