On Wed, Oct 17, 2018 at 5:07 AM Dominik 'Rathann' Mierzejewski <dominik@greysector.net> wrote:
On Tuesday, 16 October 2018 at 22:38, Dominik 'Rathann' Mierzejewski wrote:
[...]
> And I agree, too much clicking. Reading e-mail with mutt on a terminal
> is so much faster.

So, I tried the keyboard navigation mentioned elsewhere in the thread.
Not easy to use at all and still have to use the browser.

I believe you meant to say "still have to use a mouse." The keyboard navigation is for the browser mode - so
you are using the browser to access it.  I've tried the shortcuts and use a few... I mix and match.
 
I tried the mailing list mode to have it send me e-mail messages,
but the messages are multipart/alternative (html+text) with the
text part mangled and containing pieces of HTML code. Failure here
as well.

Could this be because of the particular email client you're using?  I use
gmail and they look fine.  Probably not fair to judge the system on the capabilities
of your email client.  Wouldn't the same thing happen if people sent you email from
gmail, etc. with embedded html?   What the mailing list mode does do is to allow you to
read and respond without a browser.
 

For someone who doesn't like to use a browser to access e-mail or
any kind of discussion-type messaging, Discourse is not a good
tool in my opinion.

That's fair... if your don't like to use a browser to access email.  You're entitled
to your preferences and opinion - but many people do like using browser based
email.