nail(1) on Linux
The text 08bee23b3eb1, as Debian 3.1 (Sarge) shipped it.
send and receive Internet mail
Flags it lists
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-B -
-D -
-F -
-H -
-I -
-N -
-V -
-d -
-e -
-f -
-i -
-n -
-t -
-v -
-~