sendemail(1) on Linux
The text e5a3357c5f66, as Debian 7 (Wheezy) shipped it.
Lightweight, command line SMTP email client
Flags it lists
-
--help -
-a -
-cc -
-f -
-l -
-m -
-o -
-q -
-s -
-u -
-v -
-xp -
-xu