sendEmail(1) on Linux
The text 735faf2de855, as Debian 5.0 (Lenny), Debian 4.0 (Etch) shipped it.
Flags it lists
-
--help -
-a -
-cc -
-f -
-l -
-m -
-o -
-q -
-s -
-u -
-v -
-xp -
-xu