wmbiff(1) on Linux
The text e64d05204c38, as Debian 10 (Buster), Debian 9 (Stretch) shipped it.
A dockable Mailbox Monitor
Flags it lists
-
-bg -
-c -
-debug -
-fg -
-font -
-geometry -
-h -
-hi -
-o -
-relax -
-skip-certificate-check -
-v