wmbiff(1) on Linux
The text 5907377991a9, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye) shipped it. The page shows this text now.
A dockable Mailbox Monitor
Flags it lists
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-bg -
-c -
-debug -
-fg -
-font -
-geometry -
-h -
-hi -
-o -
-relax -
-skip-certificate-check -
-v