mail(1) on OpenBSD
The text a539dd509b7a, as OpenBSD 4.0, OpenBSD 3.9, OpenBSD 3.8, OpenBSD 3.7 shipped it.
send and receive mail
Flags it lists
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-I -
-N -
-b -
-c -
-f -
-i -
-n -
-s -
-u -
-v