muttdown(1) on Linux
The text fa42ae7d271c, as Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster) shipped it.
Sendmail replacement that compiles markdown into HTML
Flags it lists
-
--config_file -
--envelope-from -
--print-message -
--sendmail-passthru -
-c -
-f -
-p -
-s