mail.local(8) on OpenBSD
The text 199967cfeab8, as OpenBSD 6.7, OpenBSD 6.6, OpenBSD 6.5, OpenBSD 6.4, OpenBSD 6.3, OpenBSD 6.2, OpenBSD 6.1, OpenBSD 6.0, OpenBSD 5.9, OpenBSD 5.8, OpenBSD 5.7 shipped it.
store mail in a mailbox
Flags it lists
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-L -
-f -
-l