There’s also an open-source utility for the job that I’ve been using constantly: Pandoc. Pandoc calls itself "a universal document converter," with support for dozens of markup formats and document ...
You can install Notepad++ on Linux using an unofficial Snap package with the command "sudo snap install notepad-plus-plus".
Nmap is an essential tool for anyone who's serious about network security. It can be installed on any Linux distribution.
If you are unable to thread MIME format emails, then the chances are Microsoft Outlook has mistranslated them. The good part is, you can modify them so that it can be read and displayed by your email ...