mh-mime(7mh) on Linux
The text 4367a59e700e, as Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
Overview of nmh(7) MIME message composition and display
The text 4367a59e700e, as Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
Overview of nmh(7) MIME message composition and display