smtp(1) on OpenBSD
The text e83ab7a82859, as OpenBSD 6.8, OpenBSD 6.7, OpenBSD 6.6, OpenBSD 6.5, OpenBSD 6.4 shipped it.
Simple Mail Transfer Protocol client
Flags it lists
-
-C -
-F -
-H -
-h -
-n -
-s -
-v