mailpost(8) on Linux
The text 9b850f13ebcf, as Debian 12 (Bookworm) shipped it.
Feed an e-mail message into a newsgroup
Flags it lists
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-a -
-b -
-c -
-d -
-f -
-h -
-m -
-n -
-o -
-p -
-r -
-t -
-x -
-z