filter(1) on Linux
The text 1a54d1b6dec4, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch) shipped it. The page shows this text now.
filter incoming messages before adding to mailbox
Flags it lists
-
-S -
-c -
-f -
-l -
-m -
-n -
-o -
-q -
-r -
-s -
-v