I am receiving this mailing list on Windows too.
That is what I must use at work. (There is no AutoCAD, or Corel Draw! for linux)
I use Netscape 4.7 and I have had absolutely no problem with mail. Ever.
The digests appear just right.
I am not trying to persuade you to use Netscape, I am just telling you there is
nothing wrong with digests.
By the way.
Have you tried Sylpheed Claws?
You do not have to copy mail to Vim. You can set up Vim as an editor for mails
in Sylpheed. It really works. Give it a try.