mail.local(8) on Linux
The text c5bbef4e3f22, as Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
store mail in a mailbox
Flags it lists
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-7 -
-b -
-d -
-l -
-n